I generate my albums on windows 10 PC and upload the finished Jalbum folder on my Unix web site. This worked fine with good old Turtel.
To adapt an old Turtel project with sub folders (2011) for smartphone I switched the theme to Tiger, and it worked fine on the Widows PC.
Once uploaded, Problem :
1 - the subfolders icons did no more display (only the menu bar gives access to the subfolder albums)
2 - the subfolder album named "QE à bord" produces a 404 error
3 - So I finally suspected the French accent on the "à" in the folder name "QE à bord"
4 - Replacing the "à" by "a" solved the pb as a turn around
Turtle handled correctly a name like "QE à bord" and Tiger does NOT !
Tiger probably generates a non portable code for accentuated characters.
Liceced jAlbum v 15.0.6
Tiger v 1.8.2
I have not yet uploaded a Tiger v 1.9.1 generated version
As soon as possible I'try to follow the recommendation :
1) setup the album without accents in name and folder names
2) and later on, modify the displayed name for the folder using the needed accents.
3) find out if the server is OK with that.