How to rename file with Action including %_length%?

Hi All,

I was hoping someone could tell me what I'm doing wrong.
I'm trying to rename a file after doing a list of actions.
My final action is to format value,
Fieldname: _FILENAME Value: '%artist% ~ %album% ~ Time %_length%'
It does rename the file, but the reads, Artist ~ Album ~Time 165445

If I do a Convert TAG-->FIlename Value ' %artist% ~ %album% ~ Time %_length%'
the output is Artist ~ Album ~Time 16_54_45

I can't seem to find an option to use Tag-Filename in the action options.
I'm trying to add the underscores to the time with an action command.

I'm sure it's something simple. I couldn't find anything on this searching.
Thank you

Since : is not a valid character for Windows filenames, you can try %_length% with $validate() and replace the : with an underscore:

Field:
_FILENAME
Format string:
%artist% ~ %album% ~ Time $validate(%_length%,_)
image

And you are right:
Convert Tag -> Filename automatically applies this validation and replaces the : with and _

Hint:
Since the ARTIST and ALBUM could also contain not allowed characters in the Windows filename (like /?*"<>|: ) you should think about what you want do with such characters.

Thank you this works great! Everyone here is awesome, always will to help out!