Upload in background

I'm a dropbox (and box) user. I take lots of pics and videos for specific clients. I then upload those images to folders for each specific client for review later. More recent versions of my phone and ipad will not continue uploading those images in the background. I have to be physically looking at the dropbox upload screen in order for uploads to continue. If I even navigate to a different app, even though the dropbox app is running in the background, all uploads stop until I physically return back to the Dropbox screen. If my screen goes to sleep, the uploads stop. It didn't used to be this way. It doesn't matter if I'm on wifi solely, if I'm on data solely or if I'm on wifi assist. Unless I am physically looking at the dropbox uploads screen, all uploads stop. Does anybody know a workaround for this? It's absolutely maddening waiting sometimes hours for hundreds of images to upload while ensuring my screen is awake and I'm looking a the the dropbox app.