Thank you for the reply.
As you were able to open the new folder when bit of the data moved from the problem folder, this seems to be an issue with the folder size which is unable to be accessed in the iPad which might be the limitation issue.
You may provide feedback regarding this issue to iPad support forum.
Thank you.
If you read my question, you will see:
- I have an iPhone, not an iPad.
- This is not a hardware problem as I can access the folders though the OneDrive app on the iPhone, which works just the way it is supposed to.
This is a glitch in the Office app. Maybe this app, due to a bug, can't open folders with high capacity. But I can tell you didn't investigate that yet. Could you please do so?
Perhaps you have some questions. For example, it may be useful to be aware the what is directly in the folder is more folders, not files, and only at the next level come some files, but mostly yet more subfolders.
Again, all works fine on the iPhone through the OneDrive app. This is an Office app problem.
Thank you for giving this further review.