The last time that happened to me it was because the file was a TIF or some such. I think jpegs and PNGs are OK. Also, the file may have to be relatively small -- I think the system wants under 100k but it will compress a little sometimes.
The last time that happened to me it was because the file was a TIF or some such. I think jpegs and PNGs are OK. Also, the file may have to be relatively small -- I think the system wants under 100k but it will compress a little sometimes.