Hi Matt,
Since this forum focuses more on questions related to Office desktop applications, if you need further assistance on this problem, I'd recommend you post a new question to the following forum:
Office Mobile forum on Microsoft Answers. You may get more helpful replies there.
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us.
In addition, QNAP is a third-party product, we cannot give you good advice on the use of third-party products.
As far as I know, MS Office for Android can edit documents on other cloud storages, but we cannot judge and analyze the issue encountered during use.
Thanks for your kind understanding.
Best regards
Itch Sun
Please remember to
mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact
tnmff@microsoft.com.
Click
here to learn more. Visit the dedicated
forum to share, explore and
talk to experts about Microsoft Office 2019.