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Quick answer

Open Settings → General → iPhone Storage and identify the largest category. Start with an unused app you can reinstall or a downloaded video you no longer need offline. For iCloud Drive, use Remove Download to retain the cloud file. Do not delete important photos just because they appear in iCloud: synced deletions can remove them there too.

Choose the check that matches your symptom

Start with the row that describes what you see. You do not need to try every step.

Match your symptom to the relevant check
What you noticeWhere to start
Unsure whether the warning means iPhone or iCloudCompare the two storage totals.
One unused app takes a lot of spaceCompare offloading with deleting.
Photos uses most of the phoneCheck sync and optimization first.
Large iCloud Drive files are downloaded locallyRemove the download, keeping the cloud file.
Downloaded TV shows occupy spaceRemove a watched offline video.
You only have one copy of important contentMake and verify a separate copy.

Before you start

  • For iPhone on iOS 26 or 27; older layouts may differ. This guide covers device storage. If the alert specifically says iCloud is full, check the cloud total first.
  • Protect irreplaceable photos, recordings and documents with a separate, verified copy before deleting originals. A thumbnail in another device’s synced library is not an independent backup.
  • Keep access to essential apps and files, especially authentication, travel and work items. Do not erase the phone, empty Recently Deleted, or install a cleaner app just to test a guess.

Why this happens

A full phone and a full iCloud account are different problems. Apps and offline media occupy the phone’s fixed capacity. iCloud holds synchronized content and backups. More cloud space alone does not enlarge the phone, and a cleanup should target the category that is actually large.

What to do, step by step

Try one step at a time. Stop when the issue is resolved. If an instruction doesn't match your device, use the official model-specific guidance instead.

1

Check which storage is full

  1. Open Settings, tap General, then iPhone Storage.
  2. Let the category chart and app list finish loading.
  3. Note the biggest item.
  4. Next, return to Settings, tap your name, then iCloud to check that separate total.
  5. Use the iPhone chart to choose the next check below.
If only iCloud is full, use Apple’s iCloud-storage guidance. Do not delete local data at random.
2

Offload an unused app instead of deleting its data

  1. In iPhone Storage, tap an app you do not currently need.
  2. Compare App Size with Documents & Data.
  3. Choose Offload App and confirm only if you can reinstall that app later.
  4. Offloading removes the app itself while retaining its data; Delete App can remove both.
Do not offload your only authenticator or an app you rely on offline. If its documents dominate the total, offloading may save little space.
Synthetic app-storage example showing Offload App separately from Delete App.View larger
Original AI-generated close-up example, not a captured screenshot. Names and sizes are synthetic; menus can vary. Match the action label on your device.
3

Optimize Photos without deleting the originals

  1. If you already use iCloud Photos, open Settings → your name → iCloud → Photos.
  2. In iOS 27, open iPhone Storage within this Photos screen; on iOS 26 or earlier, the storage options are on the Photos screen itself.
  3. Select the Optimize Storage / Optimize iPhone Storage option.
  4. It keeps smaller versions on the phone and originals in iCloud as space is needed.
Check that syncing has completed and iCloud has room. Optimization is not instant. If Sync this iPhone is off, enabling it uploads your library to iCloud; decide whether you want that before proceeding. Deleting synced photos is not a way to keep them only in iCloud.
4

Remove a local iCloud Drive download

  1. Open Files, tap Browse, then iCloud Drive.
  2. Touch and hold one downloaded file that you do not need offline.
  3. Tap Remove Download if offered.
  4. This removes its local copy while keeping it in iCloud Drive for later download.
Do not choose Delete. This check is for downloaded iCloud Drive files, not the only copy stored under On My iPhone. If Remove Download is absent, leave the file alone and check its location.
Example.pdf context-menu crop with Remove Download distinct from the red Delete action.View larger
Original AI-generated close-up example, not a captured screenshot. Names and sizes are synthetic; menus can vary. Match the action label on your device.
5

Remove a watched Apple TV download

  1. Open the Apple TV app and go to Library.
  2. Tap Downloaded, find a movie or episode you no longer need offline, swipe left on it, then tap Delete.
  3. Start with one item and review the result.
  4. Other streaming apps have their own download controls.
This removes the downloaded video. Before removing travel downloads, check that you will have internet and continued access to the title when you next need it. Do not confuse this with deleting personal videos from Photos.
6

Make a separate copy before removing personal content

  1. If you need to preserve photos already in iCloud, use a computer with available space.
  2. Sign in at iCloud.com yourself, open Photos, select the items to copy, and use Download.
  3. Open the downloaded files and confirm the wanted items are present before considering deletion anywhere.
  4. Follow Apple’s archive instructions for a larger library or another file type.
Do not download a second full library onto an already full iPhone. If syncing is incomplete or you cannot verify the copy, stop. With iCloud Photos enabled, deletions are reflected across the synced library.
7

Check the result before removing more

  1. Return to iPhone Storage, let the totals refresh, and compare them with your starting point.
  2. Try the operation that was blocked, such as saving a photo or downloading an app.
  3. If it now works, stop clearing things.
  4. Keep a note of what you removed.
Do not treat System Data as a folder to delete. If it remains unusually large or the phone cannot operate normally, ask Apple Support to review the storage breakdown before attempting an erase.

Still not working? Know when to stop

Stop if an important file has no verified copy, the cloud library has not finished syncing, or a menu does not match. If the phone still cannot save content, tell Apple Support the iPhone model, iOS version, available storage, largest category, and which cleanup changed the total. Do not share account passwords or private photos. A factory reset is not the next routine cleanup step.

Write down the exact model and error message before contacting official support.

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Useful tools, only if they fit your situation

Try the free checks first. Compare these optional products for the specific uses below; buying equipment does not guarantee a fix.

A NAS stores copies on your home network; it does not add physical storage inside an iPhone. First copy and verify the complete files, keep another independent backup, and only then decide what can safely leave the phone. Deleting an item from iCloud Photos can delete it from other synced devices. Neither RAID nor synchronization replaces a separate backup.
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  • Home photo-storage optionOptional

    Synology BeeStation Plus 8TB personal cloud (BST170-8T)

    Keep an independent photo and file library at home with the storage drive already included.

    • 8TB included hard drive; usable capacity is lower.
    • BeePhotos supports phone-photo backup; verify the copied originals before removing anything.
    • Ethernet connection to your router and power are required.

    Consider only when: You want a drive-included home archive and will check that complete copies open correctly before removing originals.

    Check compatibility: For a home network with a spare Ethernet port and a supported phone app/browser. This does not increase the iPhone’s built-in storage. Check current app requirements and how iCloud-optimized originals are downloaded before planning a full-library copy.

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    UGREEN NASync DXP2800 two-bay NAS — diskless

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    • Two drive bays; compatible storage drives must be purchased separately.
    • Intel N100, 8GB DDR5 memory and one 2.5GbE network port.
    • Phone-photo backup and remote-access features require setup.

    Consider only when: You want configurable two-bay storage, can supply compatible drives and will maintain an independent backup.

    Check compatibility: Budget for supported drives, a router connection and configuration. A faster network port only helps with compatible network equipment. RAID is not a separate backup; keep another independent copy of irreplaceable files.

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Frequently asked questions

Why is my iPhone full when iCloud has free space?

They are separate storage pools. Local apps and downloaded content still use the phone. Photos optimization can reduce local photo storage when configured; spare cloud capacity alone does not increase device capacity.

Does offloading an app delete its documents?

Offload App keeps the app’s documents and data. You still need to reinstall the app to use it again. Delete App is different, so read the selected action before confirming.

Can I delete photos from the phone and keep them in iCloud?

Not by deleting them from a synced Photos library: that deletion propagates. Use optimization to reduce local storage, and keep an independent archive of anything irreplaceable.

Why is Remove Download missing in Files?

Check that you are looking at a downloaded file in iCloud Drive. A file stored only under On My iPhone is different. Do not substitute Delete when you want to preserve the cloud file.

Should I empty Recently Deleted to get space back?

Do not make that your first cleanup. It removes a recovery opportunity. Verify separate copies of anything you want to retain before any permanent deletion.

Sources and editorial transparency

Documentation checked: 2026-11-06. Our instructions are written for this guide. Interface labels can change; this is a source review, not hands-on testing of every device.

Reference titles and source dates
  • Apple — device storage and iCloud storage — source dated 2026-10-30
  • Apple — check iPhone and iPad storage — source dated 2026-10-13
  • Apple — manage photo and video storage — source dated 2026-10-01
  • Apple — set up and use iCloud Photos — source dated 2026-09-14
  • Apple — remove downloads in Files — source dated 2025-09-15
  • Apple — manage the Apple TV library
  • Apple — archive or copy iCloud information

Prepared by TechTweety Editorial · Source-backed troubleshooting guide.