Cannot open .otf file created with Fontself

I created a typeface with two weights in Fontself.
For some reason, I am no longer able to open one of the weights.
When I click “Open” the .otf file is not available/visible, even though it is in the folder when I look in the Finder.
I have tried quitting Illustrator and restarting my computer but no luck.
Any ideas other than re-creating the weight again?