One thing I observed when using the plug in was that I would add my fonts to the fonts folder on my kindle, then go to the Calibre collections settings and select the font name from the drop down menu.
After doing this, when I looked in my fonts folder there were the original files with the name Bookerly-italic.ttf etc. PLUS new alt files which had been added. (alt-italic.ttf etc.). I noticed that the corresponding alt files were exactly the same size in kB as the respective Boorkerly file, in each case.
So it looks as if the functionality of the Calibre Collections is to make a duplicate of the font files matching the name on the drop down menu and then rename them as alt files so they are selectable from the kindle fonts menu.
I tried running the restart and font selection both with these files present and after deleting them, leaving the Bookerly ones alone. Neither way worked.
Sometimes other files are also created, named _Bookerly-italic.ttf etc. which are grayed out and much much smaller than the proper font files. These are, oddly, selectable from the drop down menu too.
It’s all quite strange really.
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