Email not copied to Sent

When i send an email from my desktop, it gets put in the Sent folder using Thunderbird.
On my mobile, even though that same setting is selected in K-9 Mail, it gets put nowhere!
My partner also has a similar Android mobile, with exactly the same settings, and his saves outgoing email to his Sent folder.
What else can i try please?

Please check Settings / account / Folders.
Is a remote folder set as Sent Folder?

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