For an app like notebook which has the main purpose of analyzing a user provided binary file, I would like to provide a default file to have cells populated with example content. I found a solution using file attachments and mutable cells but it took me quite some time to get to a working configuration, undoubtedly due to my inexperience. Here is a boiled down example:
It works but it requires an extra cell just for mutating and I am not sure if I use the mutable concept properly. I was looking for an example since use of file attachments for placeholder content seemed an obvious use case but could not locate any.
Any feedback or pointers welcome, Andreas