How to recalculate MD5 with Total Commander after adding new folders to an archive?

Question

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Hello, I’m a little confused and don’t understand the sequence of actions:
there is a large ARCHIVE directory. Nearby lies ARCHIVE.md5, which takes into account the contents of the archive.
I want to add several folders to this ARCHIVE from another disk for storage. How then to correctly recalculate MD5 using Total Commander, so that new folders are now taken into account in it?

It is clear that I can re-create the ARCHIVE.md5 file again, but I am concerned about the issue of complete and accurate continuity. And then all of a sudden, while I am adding folders to the ARCHIVE, some bytes in it, according to the law of meanness, will be beaten, and I will never know about it.
Is it possible to rebuild md5 somehow with new data? Maybe it's just that there is such a function in the TS - like, "recalculate the hash taking into account the new content."

Thanks in advance, I always choose Answer-solution.