So…
I’m trying to share a file from my iPhone to my Onedrive storage. Been doing it successfully for ever - not now.
- Sync of photos works fine
- No other issues
Here’s what I’m getting. Any ideas, please?
I’ll try that … nope 
And I’ve reinstalled the app.
A workaround could be to use the new Files app and export the file into there. The app can now access third-party storage such as OneDrive. You might need to open the files app itself before and enable OneDrive like so:
Thanks @Rjevski, I’ll take look. Bloody annoying though…
So…update…
Whilst doing that I disabled the existing “Onedrive” option thus:
Then attempted to upload with the “more…” -> “Copy to Onedrive” option.
Bingo 
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Just a word of warning I’d be very careful with the iOS Files app. I used it to upload some documents to OneDrive which then disappeared and then the links I downloaded them from had expired which was a bit annoying.
Since then I just use OneDrive’s own upload feature similar to the OP but occasionally get issues depending on the network I’m connected to. Easiest way for me was to switch to/from 4G instead of WiFi and it seemed to jig it.
I regularly have the issue but luckily it doesn’t persist.
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Thanks, @TTJJ.