When I upload an image containing some accent on the name of the file (á, é, í, ó , ú, etc), the script does not create any of the three image sizes, and although it seems all is well in the same window where you should see the thumbnail, you see an empty space.
By removing the accented character in the file name and uploading it again, that problem no longer occurs.
What I can do to accept files with accents in the name of the file?