Thanks a lot for your reply. I don't think that the files are invalid or too thin. I have the problem with all files. Even with the ones I downloaded. After waiting around 30 minutes the files just appeared and after that I could load every file. But after closing and opening Cura again, I had to wait for another 30 minutes for the first file to load.
It feels like Cura first needs to figure out where the files are stored and then there is no problem to load them.
I hope this is not too confusing.
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Slashee_the_Cow 409
My guess would be that the STL files are invalid - could you attach them to a reply so we can have a look at them?
Although looking at your file name (First_Layer_Oval_0.2.stl) - is your object 3D? Cura can't handle STL files which define two dimensional shapes, and if it's incredibly thin (like, say, 0.2mm) it may be considering it close enough to flat, which would make it a non-manifold object which Cura will also object to.
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