Having problems uploading a file and attaching it to a post. This is the message below that shows up in the Activity log. We just recently upgraded from 4.32 to 4.37 anyone have any ideas?
-- File '5186AcroJS.pdf' uploaded by 'jreichelt' (IP: xxx.xxx.xx.x) --
It just contains 0 bytes.
Reported on Movable Type 4.3

Can you try to upload a few other images and see if you are getting the same error?
It might be that the very image in question didn't pass the image validation.
That rarely happens with some images that weren't properly created. I've seen that behaviour once and after opening such an image and saving it again with PhotoShop or Gimp it worked.
Kind Regards,
Mihai Bocsaru
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Daily Movable Type Consultant
Web Development
Movable Type Consulting
Six Apart Partner
http://www.pro-it-service.com/
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Movable Type Demo
http://www.movabletypedemo.org/
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Open Melody Demo
http://www.openmelodydemo.org/
They are still having the same issue with multiple PDF files.