File exists in SQL return 0

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SQL

FileStream

I have Two sql users
1) Server Role is SystemAdmin
2)Server Role is Public

I am checking in a particular folder whether file exists or not.
When I execute query for 1st User it returns 1 (as FilePath exists) but same file path when I execute for second user it returns 0.

Is there any access level / Permission level issues ?

If you have any ideas then let me know.