Hi @Tpuehri,
If you mean to update the File property, then I don't think File identifier would be helpful here.
It would need to use the Item Id to update the corresponding item (file properties) fields.
And this is not a property provided by the create file Action.
We need first take use of the SharePoint ->Get Files(properties only ), then add a filter to find the proper item and then update the corresponding field:
See screenshots:

The formula used under the Condition is the following:
@equals(
items('Apply_to_each')?['{Name}'],
first(
split(body('Create_file')?['DisplayName'],'.')
)
)
This is because the Name or the DisplayName content from the Create File content would contain the file extension, while the Name content from the Get Files(property only) don't contain the file extension, so to make the condition work, we need to split the DisplayName field.
Please check and see if this would work for you.
Running results from my side:

Regards,
Michael