Liquid Studio 2020
Properties - Source Data (Text Reader Component)

Default input filename

If the reader component does not have a connector to the 'Filename' or ' Text Source' then the filename is read from this property.

If the connection point 'Filename' or ' Text Source' is connected, then this is ignored (and can be blank)

Store as relative path

Indicates that the filename is to be resolved relative to the data mapping file (.dm). If the transform is compiled the filename will be resolved relative to the compiled exe.