Lost .png images within post

A recent post in Parts and Features had about five .png images included within the post.  Ten days later I opened that post again but the images were missing, although the image place frames were still there with the image file name listed top left hand corner. Double clicking on the file name resulted in the "Oops" error message saying file not found.  Is this normal?  If so then:

1.     how long are the images kept before deleting?

2.     if they're not deleted, is there a way to retrieve the image file from the forum (apart from asking the poster to emal them to me)?

Thanks,

Bevin

SolidworksGeneral