This is a feature request that arose while browsing several apps’ contents to get sample files for tooling and reverse-engineering purposes.
It’s probably a niche use case, so I’m writing it down here so that we can discuss its relevance and complexity.

Browsing an app's contents from Opolua is very straightforward (“Show contents” option from an app’s contextual menu), but once you find a file you want to, say, copy, it’s getting more complicated.
On macOS, app contents are stored by default in a user library container, whose location is not easy to find (it’s a random ID) and almost impossible for non-technical users.

After a quick discussion with @jbmorley about this need, 3 options came to our minds:

• Adding a “Show in Finder” option to apps’ contextual menu
• Allowing drag’n’drop from the app contents browser view
• Adding a “Share…” option to app contents’ contextual menu

To be discussed, challenged, prioritised or cancelled!