You will want to make a backend API workflow with a Property parameter and a file (the bubble datatype) parameter.
Then with the Bubble multifile uploader, after the upload is complete do Schedule API workflow on a list pick your new workflow
Set the list to run on to the multifile uploads list of files
Set the Property value to the correct property
Set the file value to This file
Inside the workflow do Create a Thing → File (your datatype) and set the file and Property to the parameter values
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