I did see that thread. Unfortunately I can't rely on ActiveX, there are too many Chrome and Firefox users I have to account for.
There is a SP.Base64EncodedByteArray() method in the JSOM, but I can't seem to figure out how to use it with the input coming from an input type="file" field.
There is a SP.Base64EncodedByteArray() method in the JSOM, but I can't seem to figure out how to use it with the input coming from an input type="file" field.