[Wiki Loves Monuments] Thumbnails not appearing when uploading

[Racso]

I'm having some trouble when uploading multiple photos at the same time, as
the photos thumbnails aren't appearing after the upload. That forces me to
fill the pictures data (IDs, names, etc.) without seeing the corresponding
images, which is difficult if pictures for multiple monuments were uploaded.

Is this normal? Someone else has had this problem?

Racso
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