I made a first attempt.
Export with ‘MD - Markdown + Front Matter’ to C:/md
Copied the directory C:/md to an external SSD drive to F:/md and safely unmounted the SSD.
Connected the external SSD drive to another computer and imported it from there into my ‘Temp-2’ profile.
Import with ‘MD - Markdown + Front Matter (directory)’
After a few minutes, the following error message appeared
Invalid package F:\md\a -
Notebook\C:Users\User\AppData\Local\Programs\Joplin\resources\app.asar
I confirmed this with ’OK".
What bothers me about the result is that not a single screenshot made it into the notes.
Only symbols for broken images are displayed.
EDIT:
The Markdown links aren't working.
P.S.
The first attempt resulted in a subdirectory that cannot be copied or deleted.
The name of the Joplin folder and a note contained therein each contained over 50 characters and the special character &.
In my export directory C:/mdxxx, I now have a subdirectory that cannot be deleted or renamed.
Before the second export attempt, I gave the corresponding Joplin directory and the corresponding note a short name without special characters.