We have an adaptive form that accepts attachments. On a recent failure to send the flattened .pdf with the Send With Document activity, the attachments were about 2.5 MB a piece upon submission. After assembling the .pdf, the attachments grew to ~15 MB a piece. The error message we receive is: 08:05:23,531 WARN [com.adobe.image2pdf.bmc.Image2PDFConverterInternal] (RequestProcessor-35) ALC-PDG-001-000-Jpeg specific converter failed JFIF APP0 must be first marker after SOI.
It is puzzling to me that the assemble .PDF works just fine with this form and its attachments. It just fails to send the email. When I open the image in Notepad, there is no JFIF but instead Exif but then I opened a personal image in Notepad and it also had Exif and sent through the process without error.