cannot save builds to gallery or library

I have also found recently that my saves to the library seem to time out more quickly than they used to. It does seem to save faster, which is great if you have a small to moderately sized lot, however, if you have a large lot it can be fidgety to get it to save to the library. I have found with a large lot it most often gives the timed out message, and may or may not have saved to the library, with the message. When it's not taking I have tried various things – exit and re-enter, remove cache in-between, save with a new name or not by choosing 'overwrite', save with no sims currently living on the lot – and some other things that sometimes worked when the normal way did not. My internet connection is fast, I have no Mods/CC, I have a capable computer plus all packs, and I'm on Mac.