Update File Properties, why i cannot populate an image

Iron Contributor
I have a word document template inside SharePoint Document library where i have added some Document properties to it, which include:-
 
1) Text properties, such as GranteeName & GranteeAddress:-

image.png

 
 

2) Images properties, such as ApproverSignature:-

image.png
 

 

 
Now using the "Update File Properties" action, i can populate the Text properties, as follow:-
 

 

 

 

 
 
but the ApproverSignature property did not appear inside the list of properties, so how i can populate the template's ApproverSignature property ?
 
I tried this using another tenant, which i have premium license on, and i can do so using the "Populate a Micrsoft Word Template" action , as follow:-
image.png
 

 

 
so cannot we do the same using "Update File Properties" action?
 
Thanks
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