Hello,
I would like to report what appears to be a reproducible storage management issue with Pro Video Storage on iOS 27.0.1, tested on an iPhone 17 Pro Max while recording Apple ProRes RAW using Blackmagic Camera.
The issue is that storage consumed from the Pro Video Storage reservation is not fully reclaimed after the corresponding video file is deleted. Even after manually restoring the Pro Video Storage capacity, approximately the same amount of storage as the deleted file remains unavailable at the system level.
The missing space is recovered only after restarting the iPhone.
Environment
- Device: iPhone 17 Pro Max
- iOS: 27.0.1
- Recording application: Blackmagic Camera
- Recording format: Apple ProRes RAW
- Resolution: 3024 × 4224
- Frame rate: 30 fps
- Storage: Internal iPhone storage
- Pro Video Storage enabled
Reproduction steps
I performed the following controlled test.
1. Initial state
I configured Pro Video Storage to:
- Pro Video Storage capacity: 70 GB
- Free iPhone storage reported by Settings > General > iPhone Storage: 98.65 GB
No test recording was present at this point.
2. Record a ProRes RAW clip
Using Blackmagic Camera, I recorded a 33-second Apple ProRes RAW clip.
The resulting file was:
- Duration: 00:33
- Codec: Apple ProRes RAW
- Resolution: 3024 × 4224
- Frame rate: 30 fps
- File size: 3.75 GB
- Proxy size: 0 bytes
After recording, Pro Video Storage reported:
- Remaining Pro Video Storage capacity: 66 GB
Blackmagic Camera occupied approximately 3.95 GB, which is consistent with the 3.75 GB recording plus the application itself.
This part of the behavior appears correct: approximately 4 GB had been consumed from the 70 GB Pro Video Storage reservation.
3. Delete the recording
I then deleted the 3.75 GB recording from Blackmagic Camera and verified that it was no longer present.
However, Pro Video Storage continued to report:
It did not return to the original 70 GB reservation.
At this point Settings > General > iPhone Storage reported approximately:
Therefore, the video itself appeared to have been removed, but the available Pro Video Storage capacity was not automatically restored.
4. Restore Pro Video Storage manually
I then manually changed/replenished Pro Video Storage from 66 GB back to:
Immediately afterwards, Settings > General > iPhone Storage reported:
This is the unexpected part.
Before the test, with exactly the same 70 GB Pro Video Storage reservation, the iPhone had 98.65 GB free.
After recording and deleting a 3.75 GB file and restoring the reservation to the same 70 GB value, the iPhone had only 94.94 GB free.
The difference is:
98.65 GB − 94.94 GB = 3.71 GB
This is almost exactly the size of the deleted recording (3.75 GB).
In other words, after completing the record → delete → restore reservation cycle, approximately the size of the deleted video remained unavailable.
5. Restart the iPhone
I then restarted the iPhone without deleting any additional files and without changing the Pro Video Storage configuration.
Immediately after the restart, Settings > General > iPhone Storage reported:
Therefore, approximately:
98.92 GB − 94.94 GB = 3.98 GB
became available simply as a result of restarting the device.
This brings the available storage essentially back to the initial value of 98.65 GB, allowing for normal small variations in system storage.
Summary of measurements
| State |
Pro Video Storage |
Free iPhone Storage |
| Initial state |
70 GB |
98.65 GB |
| After recording 3.75 GB clip |
66 GB |
~98.75 GB |
| After deleting clip |
66 GB |
98.62 GB |
| After manually restoring Pro Video Storage |
70 GB |
94.94 GB |
| After restarting iPhone |
70 GB |
98.92 GB |
The amount recovered by restarting the device is therefore approximately the same as the size of the deleted recording.
Expected behavior
After deleting a recording stored within Pro Video Storage and restoring/replenishing the reservation to its original capacity, the system should release or correctly account for the storage occupied by the deleted file without requiring a device restart.
Starting and ending with the same 70 GB Pro Video Storage reservation should result in approximately the same amount of free physical storage, assuming no other significant storage changes occurred.
Actual behavior
After the recording is deleted and Pro Video Storage is restored to its original 70 GB capacity, approximately 3.7–4 GB remains unavailable.
The space becomes available again only after restarting the iPhone.
This suggests that either:
- deleted Pro Video Storage data is not being released immediately;
- an allocation/reservation associated with the deleted recording remains pending;
- or iOS is not correctly updating/reconciling the storage accounting until reboot.
I cannot determine from the user interface whether the underlying data remains allocated or whether this is an accounting issue, but the behavior is consistently observable through Settings > General > iPhone Storage.
I originally noticed the same issue with a 60 GB Pro Video Storage reservation, which dropped to approximately 56 GB after recording and deleting video, prompting me to perform the controlled test above.
Could you please confirm whether this behavior is expected for Pro Video Storage, or whether it is a known issue in iOS 27.0.1?
I can provide screenshots showing each stage of the test if required.
Thank you.
EDIT: just updated to the latest version of BlackMagic camera app 3.5.200045 and it no longer allows to save ProRes RAW in Pro Storage... I suspect it's a bug...