Server Error uploading to gallery/library

MichyCoe79​ This is likely not relevant for you (or maybe anyone's situation on this report), but do you have the issue if you remove (and save) your 'Tray' folder in your 'The Sims 4' folder (Documents > Electronic Arts > The Sims 4) (just save it in a safe place on your computer or a thumb drive since it has all of the stuff you have worked on in it)... Then you can re-start the game and it will create a brand 'Tray' folder, but it will not contain any of the things you added to your Library.

I mention this just in case anyone is having the issue that I did at one point... I had a time where I had saved so many items to my 'Library' that it was bloated and causing me issues. In the end I ended up doing research on how to do this and I saved out some of the files in my Tray folder to only add occasionally for a specific purpose... so I can switch out my Tray folder at that time, then put my not-bloated one back in afterward. So in other words, I had to work on making sure that my 'Library' (Tray folder) was not too big. It may also be possible that if you have a ton of 'Game Saves' in your game that the 'Saves' folder can also get huge/bloated? 

Anyway, I have no idea if any of this could be relevant to you or anyone here, I'm just bringing it up because I've had issues before if I let that folder get huge. If you experiment with this, though, be very sure to save/backup everything carefully first, since you likely have many precious items saved in those folders!