Failure to use "Merge PDFs" in Power Automate

Dear Expertise/ Specialist,

I have encountered the flow error with message “For application/pdf mime-type The input file appears to be corrupted and cannot be processed.” On the Flow of “Adobe Merge PDFs”.   

It would be great if Adobe could have a User Guide to let users know how to put the parameters correctly esp. in some scenarios such as get attachments from multiple SharePoint Items in the List/ Table....

I have 2 Tables/ Lists and the flows below:

1. From ‘Table 1’, I use Do-Loop to extract the Attachment from multiple records I needed. 
2. After that, I use “Adobe Convert Doc to PDF” function to convert the (1) Attachment from multiple records to SAVE it ALL to a single raw record in ‘Table 2’. And the Loop function ended.
3. Then,
   1. I get the Raw Record from ‘Table 2’
   2. Get Attachment
   3. Get Attachment Content
4. Based on (3) result, I append it to the array Variable “varPDF”
5. I called the “Adobe Merge PDFs” function and attach the “varPDF” to it for merging, then I could save it back to my Database.

Thank you so much.