In Firefox 61.0.1 this request goes fine 200 and file selection OS window opens
In Chrome 68.0.3440.75 and Safari 11.1.2 this request starts to have too long URI (particular in the query field named "l3" having more than 13k chars) and returns with 414 Request-URI Too Large. Additionally, in Chrome this request is also blocked by CORB as having text/html MIME type originating from non-applicable place
In Opera 54.0.2952.60 the same request errors with "307 Internal Redirect".
None of the above browsers, except Firefox, don't show expected file selection dialog after clicking the link.
Can anyone help? What data should I provide to make it possible?