Export function + embedded images

[dabru1984]

Hi!

First: the software is great and thank you for it :)

About the issue: at the first export of the newly created workout, the images embedded in the new exercises remain included in the backup also when you restore it.

But when you edit anything after the first export and try to export again, the images became white and are lost. The only way is to re-add them.

Maybe I am missing something here, thank you for the advise!