Lost phone, set "Lock device" PIN, found phone, can't access data even though I k

I lost my phone, set a "lock screen and message" with a PIN.
Then I found my phone and remember the PIN, but it hasn't asked me to enter it anywhere. I did see the lock screen and tried calling the phone number that I asked it to, but it never asked me to input a PIN.
I can access everything on my phone, but now that I am trying to upload photos to my computer, it keeps saying my device is locked and it can't access any files.

Thanks for your help!

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