Clarify `ConcreteAssetLibraryHelper::file()`
Clarify `ConcreteAssetLibraryHelper::file()`

Clarify `ConcreteAssetLibraryHelper::file()`

- Validate `$_POST[$postname]` is integer
- Use `$_POST[$postname]` if valid File ID
- Use `$bf` parameter if not

matt9mg/concrete5,MichaelMaar/concrete5,TimDix/concrete5,avdevs/concrete5,MichaelMaar/concrete5,MichaelMaar/concrete5,avdevs/concrete5,TimDix/concrete5,matt9mg/concrete5,avdevs/concrete5,matt9mg/concrete5,TimDix/concrete5