Hi!
I use 18.12.1 version.
How can I use titles?
I made them in an editor. I placed them on a work table. But they are not shown in some cases. Why?

It does not work:
https://dropmefiles.com/IF1Gt

It works:
https://dropmefiles.com/Y4TXQ

The manual https://userbase.kde.org/Kdenlive/Manual is old.
Do we have an other manual?

Should I use the Transitions to integrate my titles (subtitles)?

Yes this is not properly explained even not in the quick start part. In general, all editing software doing the same while playing: reading the timeline from top to bottom. So you have to put the title on top of all video tracks like here: https://dropmefiles.com/Y4TXQ.

But for an older versions, it is used the Transitions (affine, composite): I could not use them...