Retrieve uploaded/damaged file HEIC/pdf - pdf

Hello dear StackOverflow community,
When i uploaded the identification selfie for my exam a pdf was requested.
My silly self thought that if i change the.HEIC to .pdf by renaming it, it would get converted.
But now they cant download the file and thus cant grade me, which is horrofic for my circumstances!
The error states
websiteName/pluginfile.php/number/assignsubmission_file/submission_files/number/fileName?forcedownload=1“
Is there anything possible to do??
Thank you SO SO much :((

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