I believe your new server is either missing either a 3rd party tool
configuration (ImageMagick, ffmpeg, exitfool, etc.) or the paths to
those tools is incorrect. Another guess would be that the path to the
storage is incorrect as well and pointing to the old install.
The 3rd party tools and the storage path are all correct. We have tested
uploading the same file several times to compare. Sometimes it uploads
just fine other times we get "still in progress" and nothing