Generate error message when uploading illegal thumbnail image type

[Ironman28]

Currently, uploading an illegal image file type (e.g., TIFF) as a thumbnail does not generate an error message, it simply ignores the upload and the system auto-generates its own thumbnail.

Validation of file type and error messages need implementing.

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(unrelated issue: However, I also regularly see newly uploaded clips that have broken thumbnail images. I usually just correct them manually, but something is allowing broken image links to appear in the system without generating an error message or stopping the upload.
An example of a broken thumbnail just appeared! See Ethan Tussey's post titled "Love and Duration" http://www.criticalcommons.org/latestclips
Also here: http://www.criticalcommons.org/@@search?SearchableText=duration&portal_type=PlumiVideo )

[mgogoulos]

there's no video in http://www.criticalcommons.org/Members/MCIMR/clips/love-and-duration and it appears with a broken image on the listing. The listing should show a default image in such cases

Steve, since the video is uploaded twice http://www.criticalcommons.org/Members/MCIMR/clips/love-and-duration-1 better delete the broken video at http://www.criticalcommons.org/Members/MCIMR/clips/love-and-duration

[ahelme]

I tested this, and yes the original issue is still a problem:
http://www.criticalcommons.org/Members/anna/clips/test-video-zed-and-two-noughts/video_view

TIFF was ignored, a thumb was generated, but no error message was produced.

(Steve - you might want to delete that video as Markos suggests above)

[Ironman28]

That video has been deleted!

[ahelme]

Okay cool, so just the original issue remains.