You can install a script, then assign a custom keyboard shortcut to the script:
// Select Previous Doc
selectDoc(-1);
function selectDoc(theValue) {
function s2t(s) {
return app.stringIDToTypeID(s);
}
var descriptor = new ActionDescriptor();
var reference = new ActionReference();
reference.putOffset( s2t( "document" ), theValue );
descriptor.putReference( s2t( "null" ), reference );
descriptor.putInteger( s2t( "documentID" ), 862 );
executeAction( s2t( "select" ), descriptor, DialogModes.NO );
}
Or:
// Select Next Doc
selectDoc(+1);
function selectDoc(theValue) {
function s2t(s) {
return app.stringIDToTypeID(s);
}
var descriptor = new ActionDescriptor();
var reference = new ActionReference();
reference.putOffset( s2t( "document" ), theValue );
descriptor.putReference( s2t( "null" ), reference );
descriptor.putInteger( s2t( "documentID" ), 862 );
executeAction( s2t( "select" ), descriptor, DialogModes.NO );
}
https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html