Hello/Hi/Greetings,

As the subject says, I'm having trouble batch uploading photos via the mobile app. I'd like to use the app, since it's convenient and would appreciate any insight. :)

Steps to reproduce:
* Launch mobile app & login
* Navigate to desired album to upload into
* Tap menu in the lower right and choose 'Upload Photos'
* Select 10 or more photos & tap Upload button

Results:
* Progress bars appear for most images, progress a little, and then freeze
* Some images go directly to "Error"
* 1-2 images will sometimes upload completely
* Red banner "Connection Error" appears at the bottom

Expected results:
* All images upload successfully


Mobile app version: Piwigo NG
Mobile app last updated: Last update released Aug 2023
OS: Android 14
Phone: Pixel 6

Piwigo Environment:
Piwigo 14.3.0
Installed on 28 February 2023, 1 year 1 month 2 weeks 1 day ago
Operating system: Linux
PHP: 8.1.27 (Show info) [2024-04-16 11:33:50]
MySQL: 8.0.28-0ubuntu0.20.04.3 [2024-04-16 11:33:50]
Graphics Library: ImageMagick 6.9.10-23
Cache size 1376.44 MB right now Refresh
Activated plugin list2
Admin Tools
LocalFiles Editor

Additional information:
* Uploads through the website on mobile work as expected, even with hundreds of photos selected
* I managed to reload the website during the 'Connection Errors' experienced on the app, and it briefly showed me a 503 error saying something about "capacity" before auto-reloading