After having installed my self-hosted instance of bitwarden, I tried to import the vault both from another bitwarden vault and from 1Password.
I see the following error:
<html>
<head><title>413 Request Entity Too Large</title></head>
<body>
<center><h1>413 Request Entity Too Large</h1></center>
<hr><center>nginx/1.18.0 (Ubuntu)</center>
</body>
</html>
How can I solve it?