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Cannot sync, download or export json, XML or HTML files #17187
Description
⚠️ Before posting ⚠️
- This is a bug, not a question or an enhancement.
- I've searched for similar issues and didn't find a duplicate.
- I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- I agree to follow Nextcloud's Code of Conduct.
Steps to reproduce
- Create a folder (I did this via the web interface) of various file types. I have files ending with .json, .xml, .html, .zip, .aac, .mp3, .dB, .aes, etc...
- In the Android Nextcloud client request a sync of the folder containing these files. The three file types .json, .xml, .html will not be sync'd, all others sync fine
- If I request a download of a specific file it does not download
- If I export a specific file all I get is a 0-byte file with the correct name in the Downloads folder
If I use the web interface via my browser I can download these file types.
Expected behaviour
All file types should download.
Actual behaviour
Only files without .json, .xml, .html extensions will sync.
Android version
16
Device brand and model
Brax3
Stock or custom OS?
Custom (explain in "additional information")
Nextcloud android app version
34.0.0
Nextcloud server version
33.0.3
Using a reverse proxy?
No
Android logs
Don't have access to logcat to get the nextcloud.log
Server error logs
No server logs appear for this issue.Additional information
This smartphone is a Brax3 running iodéOS 7.5-20260519-brax3 with the Nextcloud Android client from f-Droid.
I have an older Samsung S9 (Android 10) with the same Nextcloud Android client version which has the same issue, but did not have this issue with version 33.1.2.
[edit] The same issue happens with my Samsung tablet (Android 12).
Activity
alperozturk96 commentedon Jun 16, 2026
@dschultzca
Hello
Could you try with last generated QA APK?
dschultzca commentedon Jun 16, 2026
The QA version does resolve the issue for me on Android 16, I did not try the other versions I reported.
cdisabatino commentedon Jun 19, 2026
Hello,
Me too, for the past few weeks (2 or 3). Some files could have synced with my Android phone and now they can’t. Unmodified files.
Android application nextcloud: 34.0.0
Nextcloud server: 31.0.8.1
Attached are two HTML files to test. One can sync (
test_OK.html) and one cannot sync (test_NOK.html). The only difference is an html tag (<button data="sample>sample</button>).To complete, the file that can be synchronized can also be downloaded to the phone with the download button. The file that is not synchronized is downloaded but empty, 0 bytes.
By renaming the
test_NOK.htmlfile to atest_NOK.html.txttext file, same, the synchronization and download do not work.test_NOK.html
test_OK.html
Christophe
cdisabatino commentedon Jun 24, 2026
Hello.
Synchronization and download are now functional. After updating the android client version 34.0.1
Thank you,
Christophe