On-demand checksums calculation

[opk12]

I was checking the MD5 after a big download (European regions of OsmAnd maps, ~150 MB each). Calculating all the checksums is unnecessary (one is enough for verification). Also, any app on my old phone (Samsung Android 7.1 from 2017) is slow to checksum a big file (even MD5, which is generally very fast on modern devices) so auto-running the checksums would be unnecessarily slow.

In the Properties window, what about having buttons Show MD5, Show SHA1, ... that trigger the calculation and show the result (or are replaced by it)?