[Patentpractice] reliable way to compare SHA-512 strings from Patent Center?

[William Ahmed]

Dear List,
BACKGROUND (The Old Days -- EFS Web)
Until 2023, we always submitted filings via EFS web. EFS web provided the BYTE COUNT upon filing.
This was great and important.
If 3 years later, when filing the figures for a continuation application, I wanted to make 100% sure that I was re-filing the exact same pdf file (instead of another version with the same file-name),I would check the byte count (usually using an MS-DOS window - yeah, I am over 50 years old) to make sure.

PATENT CENTER (I need the same functionality that I used to have)
Now we live in the world of SHA-512 - Patent Center gives SHA-512 rather than bye count.I want to do the same for Patent center - I want the ability to take a pdf file on my computer (e.g. 11 months after filing a US provisional), run it through SHA-512 and reproduce the SAME SHA-512 string.
I am embarrassed to say that I TRIED and I  FAILED
In Jan 2024, a US provisional was filed -- the drawings file (USProvfiguresJan2024.pdf had a SHA-512 value of "abcdefg".I now downloaded and installed a free "Digital Volcano Hash tool" -- I gave it USProvfiguresJan2024.pdf and asked for the SHA-512 string.   The 'SHA-512' hash strings did NOT match.

What am I doing wrong? 
Thanks,Bill
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