"Unfortunately, Documents has stopped" popping up whenever I try attaching a file

I have an LG G4 with Koodo running Marshmallow. Recently, I've noticed that when I try to attach a file in Gmail, a crash report saying "Unfortunately, Documents has stopped" will show up, and the file select screen will disappear. I also tried opening files using Documents in other apps which also resulted in the message appearing, so I'm quite certain this isn't a Gmail problem.

I'm not sure how long this has been going on since I don't tend to need to send attachments, but it can't have been going on for more than a week since I was still able to open Documents a week ago.

I've restarted my phone, cleared the Documents caches, and uninstalled my three most recent app installations, all to no avail.

I read on other posts and forums that it may be a OneDrive problem, but I don't and never have had OneDrive or any affiliated apps installed on my phone. The only OneDrive related thing on my phone was an old account that I removed after reading that it may be the problem. It solved the issue momentarily, but I'm now back to receiving the error message.

I restarted my phone in safe mode once to see if it was a software issue or a third party app issue, and the message did not appear in safe mode.

Any help would be much appreciated!

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