Google App Script: Send Mail, InlineImage From Js File

I use google.script.run to use the MailApp API in google app script and I pass a mail object like this : google.script.run.sendMail(mail); The mail object is structured like this

Solution 1:

FileObject is not a legal value.

Legal parameters and return values are JavaScript primitives like a
+ Number,
+ Boolean,
+ String, or
+ null, as well as
+ JavaScript objects and arrays that are composed of primitives, objects and arrays.
+ A form element within the page is also legal as a parameter, but it must be the function’s only parameter, and it is not legal as a return value

The only way you're going to get a file past through the above restrictions from client to server are if you convert the fileObject to one of the above types. I'll go with form:

If you call a server function with a form element as a parameter, the form becomes a single object with field names as keys and field values as values. The values are all converted to strings, except for the contents of file-input fields, which become Blob objects.

• Bottleneck legal values
• Forms