Hi Graham,
Thanks for the response:
Yes, to view the file in Office365 it was an External Link Widget, I then used Office365 to download the file onto the tablet itself.
Both files were exactly the same and uploaded by myself, the only difference is that one was being downloaded on Frog and the other through Office365. We have had 0 issues downloading from Office365, only from Frog.
When comparing a Device where the Frog download works and a one that doesn't, the files have two different sizes (Usually a couple of MB).
Each time we have ensured that the apps are completely up to date, this is top priority for us as it has caused issues in the past however this issue still persists regardless.
Kind regards
Nathan