When i copy files over MTP (Samsung A51/Android 10) the file's date/time is reset to current.
I suggest that it should keep the original file's date/time if possible.
(Additionally maybe a setting '[x] Keep original date/attributes')
FWIW, PCManFM 1.3.2 on Ubuntu 22.04 (System76 Gazelle 17), copying files from a Samsung Galaxy S9 phone over USB, dates and times are preserved properly.
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I don't think that PCManFM should be blamed, all operations are done by underlying GVFS module.
Thank you for reporting this, will inspect it.
FWIW, PCManFM 1.3.2 on Ubuntu 22.04 (System76 Gazelle 17), copying files from a Samsung Galaxy S9 phone over USB, dates and times are preserved properly.