Command Line Invocation of Online Acrobat PDF Fill/Sign on Linux

I run on Linux, so the access I have to Acrobat is Online Acrobat. I want to use the PDF Fill/Sign feature. I can do this manually by typing a URL in my browser and choosing the pdf from the file manager. So my work flow is I have to save the pdf attachment mailed to me, just to go hunt for it again to upload.

What I want to do is invoke the PDF Fill/Sign feature with the file path to the PDF directly from my mail program. I could make the mail program do this if there was either a command line interface that tool the file argument, or an option to the URL for adding the file name.

Is either possible?