Bug 471965

Summary: Starting a file transfer and cancelling it doesn't delete the cached/temporary/partially copied file and doesn't even shows up in the files. This fills up unnecessary storage. That can't be cleared up.
Product: [Applications] kdeconnect Reporter: Harsh NJ <gunjanpawan1003>
Component: ios-applicationAssignee: Lucas W. <lucas.wang>
Status: REPORTED ---    
Severity: major    
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Apple App Store   
OS: iPadOS   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Harsh NJ 2023-07-05 05:20:27 UTC 
SUMMARY
***
When you start to transfer a large file from KDE Connect on any of the platforms (I tested only from Android and Linux, both versions up to date) to KDE Connect on iPad, and cancel the transfer either manually, or when the iPadOS KDE connect app goes background or when iPad auto locks, that partially copied file stays on the disk, taking up space, and it doesn't even shows up in the Files up (even as a temp file that I can delete using a-shell App). Though it takes space as it shows in the iPadOS Settings App's storage menu.

STEPS TO REPRODUCE
1.  Start to copy a large (~2gb) file from some other device (on which app can go background, such as Android) to iPadOS
2. After it's done around 50% (you can see a progress bar on android device), cancel the transfer manually, or by backgrounding the app on iPad or locking the iPad.
3. Android will say "Transfer Failed"

OBSERVED RESULT
Open Settings>General>iPad Storage>KDE Connect on the iPad. The "Documents and Data" attribute will have an +1GB in it's size.
Open the KDE Connect folder in Files App, the partial file is nowhere to be found. Use some method to "see hidden files", still no good!

EXPECTED RESULT
If any in progress transfer was cancelled, the partial file must be deleted. Otherwise small file cancels will add up to a large quantity, and large files will really fill up the storage.

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
Linux/KDE Plasma: Ubuntu 22.04 LTS
Android Version: Android 10
Android KDE Connect version: 1.26.2 (Latest)
iPadOS Version: 16.5.1 (20F75)
iPad KDE Connect version: 0.3.0 (9) (Latest)
KDE Plasma Version: N/A (GNOME)
KDE Frameworks Version: N/A
Qt Version: N/A

ADDITIONAL INFORMATION
To fix this temporarily I did the following:

1. Current "Documents and Data" size for KDE Connect: 2.26GB ( actual file contents size in the files app: 533.8 MB )
2. Compress the KDE Connect folder in iPad , using the Files App. ( for backup purposes)
3. Delete the KDE Connect App Folder, and then also from the Recently Deleted bin
4. Current "Documents and Data" size for KDE Connect: 1.68GB ( with no files at all, this is the failed partial file storage )
5. Delete the KDE Connect App from iPad, and reinstall it. 
6. There shall be no entry for the App right now. Pair a new device and share something, say a photo.
7. check files storage and settings storage 
8. Current "Documents and Data" size for KDE Connect: 300kb ( size of the copied photo, in my case )
9. Uncompress the archive back into the KDE Connect folder
10. Current "Documents and Data" size for KDE Connect: 534.1 MB ( actual size of the real contents of the folder )