I’m sad to hear that.
No personal ringtones on SF 5 is a complete NoGo !
Since @coderus stopped developing for Sailfish, I see no scratch for that itch.
In the past this feature was dicussed quite often in the (old and new) forum and even here to no avail:
at 7:33
https://irclogs.sailfishos.org/meetings/sailfishos-meeting/2021/sailfishos-meeting.2021-08-05-07.00.log.html
at 7:39
https://irclogs.sailfishos.org/meetings/sailfishos-meeting/2021/sailfishos-meeting.2021-08-19-07.01.log.html
I can’t claim enough, this feature is crucial.
I’m honestly very sorry.
A workaround that was developed to fix a traditional shortcoming is rendered useless by the update instead of implementing the functionality in the OS. Not only is this no longer fun, it’s just a bit too much.
And no mending of personal ringtones in sight.
That’s where Sailfish OS ends for me after more than 10 years and ten devices.
I will not upgrade my 10 III to 5.xx …and have to start looking into something else.
…so sad.
I wish you all the best.
cheers
@spienima
And I wanted to drink ‘Feuerzangenbowle’ with you at the next meetup in Berlin. 
But at least it was fun talking last time. Have a Glenfarclas on me.