Hey there bookmanjb,
I see that you are getting a message when attempting to move mail messages on your iOS device. Here is an article for you that addresses this specific issue:
- Tap Settings > Mail, Contacts, Calendars. Then tap your email account.
- Tap Account > Advanced.
- Tap Deleted Mailbox and make sure that it's set to Trash.
- Tap Advanced, then tap Account, and then tap Done.
Now try to move a message. If you see the error message again, follow these steps:
- Tap Settings > Mail, Contacts, Calendars. Then tap your email account.
- Tap Account > Advanced.
- Tap IMAP Path Prefix, and then type INBOX/.
- Tap Account, and then tap Done.
Get help with Mail on iPhone, iPad, and iPod touch - Apple Support
https://support.apple.com/en-us/HT201419
Thanks for using the Apple Support Communities. Have a good one!