Server Error whenever I'm upload to my personal gallery

Regarding my original post, I was unable to save that lot when mods were disabled as well. Some lots would save, others would not. Rooms always downloaded successfully with or without mods. 

I "save-as" my game quite frequently post For Rent, so I deleted the save in which I was unable to upload lots to my gallery and opened a previous save of that same game (after clearing my cache files). Now, in this save file, I am able to save my lots. However,  strangely enough, once or twice, the lot I'm trying to save seems to complete in that there is no error message, yet the lot doesn't appear in my gallery.  That is certainly something I've never experienced before.

I have noticed that the lots with buildings that take up most of the available space and contain lots of furniture and clutter are the most problematic; i.e., a 20x30 triplex residential rental or a 64x64 restaurant lot that has multiple buildings, landscaping, water features like a large pond,  etc. When I've been unable to save a big lot like that, I close the game without saving, clear the cache files, reload that save, and go into build mode to delete one of the buildings and some of the decor, clutter, and landscaping. Then the lot will usually save correctly.