Fix/uploaded file

fixes #2886

Simplify inline script code

Correct classname typo

Simplify inline script code (removed extra space)

Correct classname to `BaseOAuth` instead of `BaseClient` in PHP Doc.

Simplify the rendering of the inline script (using direct markup), eliminating need for using PHP variable to store value using HEREDOC.

more expected behavior when chaining methods using
Mailser::compose()

fixes #2723

this problem occurs when joining active record but not selecting the
primary key field. records get populated but they do not have primary
key value populated which results in only one record left over in the
result.

issue #2872