Here you can discuss the Documents app.
Note that this app is deprecated: the underlying library, WebODF, was abandoned by the company developing it when the company went bankrupt a few years ago. With the quick development browsers go through, the engine can be expected to get worse and worse over time and lots of bugs are already known. It is only compatible with Nextcloud 11 at the moment, as a bug prevents Nc 12 to work and it is highly unlikely somebody knowledgeable enough comes and fixes these problems.
But - if you, dear reader, are interested in some deep javascript hacking - you can!!! This is community 