Downloading to phone

Good Morning creators!

im having A LOT of trouble downloading files from my projects to my iPhone. It doesn't happen to every file, it seems to be random, but consistent; I will ask it to download individual files or multiple files and it'll go through the whole processing and downloading wait and then at 100% complete downloading it pops up with an error "unable to download". I've tried every file type to get it to download and even closed and reopen and turning my Wi-Fi and data on and off. Nothing is working. It makes it really hard to get my work done. Can we fix the app please????