Thanks for writing to us.
For the FTP, it might be a server-related issue. Please make sure you have sufficient space on your server and you have the correct permission. I would suggest you please contact your hosting provider to upload the files.
For the WP-Admin warning,
It might be the issue of version compatibility or plugin conflict. I would suggest you please make sure your theme, WordPress, plugins, and PHP version is updated. Please note your PHP version is 7.4 or 7.4plus as per our version compatibility page.
It is also recommended by WordPress as well. Please have a look at this article.
I would also suggest you troubleshot a few common issues on this.
2.Theme Update related issue
3.Child Theme Related issue
If none of those work, It would be best if you could copy your live website to your staging area. and send your details in a secure note so that we can investigate your setting without breaking your live site. Please provide the following details
- WordPress Login URL
- Admin level username and password
- FTP Details
You can find the Secure Note button at the bottom of your posts