Just coming back with same testing, i can now use the RDD BAQ now, what i did is use the BPM and function from the below link:-
https://www.epiusers.help/t/images-from-alternate-storage-instead-of-db-blobs/107003
And adjusted the code to have file prefix with file: instead of file:> and made the base path to null, for me to add pic from multiple shared folder.
Than in BAQ i pull part table and use the below columns and make the imageID begins with file to show up that only data.
In SSRS form, i then use the external image source and select the part_imageID column, so SSRS form will pull the column name as an URL, which will shows up as image in SSRS form
