It is impossible for me to know exactly what settings need to be adjusted. It depends on the size of the file you are trying to upload and how you have configured Digital File pro
maybe try increasing:
memory_limit 128M
to:
memory_limit 256M
and :
upload_max_filesize 2M
to
upload_max_filesize 8M (or larger if you are uploading files larger than 8M)
and:
max_input_time 60
to:
max_input_time 300