Been using Piwigo NG app 2.2.3 for a while to view and upload images to my web site for 6 months or more.  1st May it started failing.

The Piwigo PHP on the server had recently had a couple of updates to 14.4.0.  I am reluctant to update these web PHP apps because of unwanted changes that they make.

I tried to see what was happening when I found an older version 1.2.1 of Piwigo NG on an old phone (IMO Q4 Pro).  I tried an upload and it worked!

I then found the deprecated Android app Piwigo 1.0.2 on another phone S5 and that also worked!  So I removed NG 2.2.3 on my main phone P20, put old app 1.0.2 on and an upload also worked!

On the S5 Pw. NG 2.1.0 also errors when uploading.

Fresh Install

I put a fresh install of Piwigo Server 14.4.0 on my hosting to rule out configuration issues, but no improvement.

On my P20, Piwigo NG 2.2.3 (latest) upload to fresh install errors too. But the old app works.

Pw. NG 1.2.1 will not run on the P20