Nothing showing up in sent folder on Android Phone

PC works fine, When sending via my cell phone, nothing shows up in SENT folder but it does send the email.
This randomly started 3 days ago

Sounds like your mail app has an issue.

Try clearing the cache and/or data in the mail app.

Failing that, If it’s an IMAP / Exchange type acct, remove the account from your Android mail app and re-add as new acct setup.