Its probably the wrong file name. Always rename your file to the exact name of the movie with no periods and proper spacing. Also remove anything about Directors cut , Unrated Edition or special edition cause it won’t pick it up.
I usually just rename it on my pc from the networked drive. It makes it much easier.
If it finds nothing just go to the search box under the cross and remove everything except the basic name of the movie and then submit. There is no need to rename your movies.