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PDF file corrupted when attched to an Email



 i have a flow that reads a note form Dynamics 365. I do get a proper base64 string that i can decode to get the actual pdf-file using e.g.


However, when i attach the file to an "Office 365 Outlook - Send email action using: decodebase64(BASE64STRING) i dont get an error in flow but the file received in outlook is corrupt and cannot be opened. Flow_setup_SendEmail_Action.PNG


I also noticed that the filsize shown as email attachment is actually ~25% larger than the acutal file from Dynamics. 




Accepted Solutions



in the end this was an easy "fix". 

I had to use "Base64toBinary" in the expression to convert my Base64-string. 





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Community Support
Community Support

Hi @mathocom,


Could you please share a full screenshot of the configuration of your flow?

How could you get the proper base64 string?


Please share more details so we would try to provide a proper workaround for you.


Best regards,




here you go. 

P.s. basically im reading the document from a note inside Dynamcis 365. This note is attached to a custom entity.


Flow is triggered by a Canvas App. via  creating a custom entity called "mscrm-addons AutoMergeWorkingitem" a document generation process is triggered. Once the item becomes inactive the document can be grabbed from a lookup to another custom entity that has the document stored as a note. from there i read the file (as base 64) and then try to send it off by email.


Flow triggered by Canvas App - read custom entity and create a ew one (AMWorkingitem) - this generates a document






i just realized that the same thing happens to *.docx files. Looks like every document im reading form a note inside dynamics gets corrupted when sending it as an outlook email attachement. 


Has anyone tried reading a doucment from a note inside DYnamics 365 and and send it by email via Office 365 Outlook?

I never used files from Dynamics 365 before, but you could probably save the file to Azure storage (or SharePoint/OneDrive for debugging) and check if the PDF is correct. If so, you could attach the file from that temporary location and delete it afterwards.


Just a thought to keep you going.


Best regards,




in the end this was an easy "fix". 

I had to use "Base64toBinary" in the expression to convert my Base64-string. 





View solution in original post

New Member

PDF file obtained from HP MFP277 was emailed and received corrupted, as was the original file still on computer.

It was readable prior to emailing

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