The problem with attachments in shorthand...

[ty-]

There is a lot of upfront data you need to provide for this to be translatable. While Remarks can technically support attachments from a syntactical standpoint, there is a barrier for usage.

Assumptions cannot be made on the required fields, so a user must provide the following information:

• display name
• usageType
• contentType
• length
• sha2

No more information than what they would have to provide while creating an xAPI Statement, however.

An alternative option is to return placeholders for everything but display name... the statement won't not be valid in this case though and could put #10 outside the realm of possibility.