you could just simple open the file manager ("explorer.exe") and go to that folder to see if it has the correct file size (and double check the file name + extension).
Normally there also comes some error message before the "No hashes loaded" message, if there is some problem with the file... so it would make sense that you post the whole output of hashcat.
You could also try to run the example hash from https://hashcat.net/wiki/example_hashes just to make sure that the example/test works.
In general I would highly recommend that you also try to create your own example/test VeraCrypt volume/container/file/disk that you generate similar to your target VeraCrypt volume and maybe even with a similar password ... and you try to crack this test "hash" with hashcat afterwards (this way you can make sure that you are doing everything correctly from the extraction to the successful cracking of the "hash").
It's always recommended to spend this little time (just a few minutes maybe) to create a similar example/test and try to see if everything is working with that one.... without risking to waste very, very much time and other resources on the target itself, and maybe you did something slightly wrong which could make the "hash" uncrackable.
Of course, if you do this... you must be very careful to not confuse the target hash with the test hash and of course make backups beforehand of all the other files/volumes etc... do not risk to lose any important data while doing so... always keep backups and carefully distinguish tests from the original "hashes" and volumes/partitions/disks.
Good luck cracking
Normally there also comes some error message before the "No hashes loaded" message, if there is some problem with the file... so it would make sense that you post the whole output of hashcat.
You could also try to run the example hash from https://hashcat.net/wiki/example_hashes just to make sure that the example/test works.
In general I would highly recommend that you also try to create your own example/test VeraCrypt volume/container/file/disk that you generate similar to your target VeraCrypt volume and maybe even with a similar password ... and you try to crack this test "hash" with hashcat afterwards (this way you can make sure that you are doing everything correctly from the extraction to the successful cracking of the "hash").
It's always recommended to spend this little time (just a few minutes maybe) to create a similar example/test and try to see if everything is working with that one.... without risking to waste very, very much time and other resources on the target itself, and maybe you did something slightly wrong which could make the "hash" uncrackable.
Of course, if you do this... you must be very careful to not confuse the target hash with the test hash and of course make backups beforehand of all the other files/volumes etc... do not risk to lose any important data while doing so... always keep backups and carefully distinguish tests from the original "hashes" and volumes/partitions/disks.
Good luck cracking