Changes to metadata are written to files in specific instances. Sending to device, saving to disk, downloading using the content server, emailing to name a few. Changing in the metadata window does not write the changes to the file itself.
Do realize that PDB is a container format and could have many different formats inside of it. Writing metadata may or may not be supported depending on what's in the PDB file. Also, different formats (not just PDB) support varying amounts of metadata inside of them.
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