Trouble uploading long recordings made with pocket recorder to dropbox

I'm using the pocket recorder app on an iPhone 6, and I really enjoy the quality of the recordings. I have a problem though, I can't get really long recordings uploaded to dropbox, although I have a stable internet connection, when I doubletap upload to dropbox, it just sits there, I left it sitting there for 3 hours, and the 2 hour and 45 minute recording hadn't uploaded to dropbox. Any help would be appreciated, because once I upload the recordings, I usually like to get them off of the device itself, and plus, these recordings are rather sentimental and important in nature, so I'd kind of like to have them backed ump somewhere.