.env tags in compose file problems

[bearded-papa]

Sorry to keep asking questions but I keep finding that things I have done before dont work.
I have compose files using
${Your_Tag}
and referenced in the .env file as Your_Tag=Tag_Content
I have also added
env_file:
- .env
as mentioned in the documentation, but get an error saying invalid tag format.
What am I doing wrong

[kmendell]

This is seperate from the .env file, its uses the actual OS to grab those variables , This is currently not supported, but i will look into it for a future release.