This happens sometimes but has happened a lot lately. My files are not uploading to Dropbox unless I have the folder open (this is on my phone, Android). I have refreshed, deleted tons of stuff off my phone, uninstalled and reinstalled Dropbox. This happens sometimes but not ALL the time. This is why I am hesitant to upgrade to the paid version, too glitchy. Anyone? Why does this happen (not a storage issue at all).
I am using an Android. My app is the latest version and my phone is up to date. I just had to upload pictures to a folder and unless the app was open to the folder the upload just stopped. Why else would it not upload in the background?