"On my Mac" e-mail content and attachments won't load on Mail application
I have created folders "On my Mac" to organize e-mails from different accounts using the Mail program.
Often, however, the content of these e-mails and their attachments, do not load.
It merely appears blank with the sender e-mail and e-mail title but no content.
Why this this happening ? and How to ensure it stops happening in the future?
Is there any way to recover the lost content?
Thank you in advance //
MacBook Air 13″, macOS 11.6