SUMMARY
If you create a title clip with an image, save it, and then create a title clip from this saved title clip with the image, then after renaming or moving the directory with the project, the image from the caption clip will be unavailable, and it will not be possible to restore the connection between the picture file and the project. This is so if the "custom project folder" is inside the directory with the project (which will be renamed or moved)

STEPS TO REPRODUCE
1. Create new project
2. Create new folder for Project (/proj/)
3. Open Project settings and change "custom project folder" to "/proj/projData"
4. crete title clip with some image and save him somwhere (not in /proj/)
5. create empty title clip
6. open him in title editor
7. open title clip from file created on step 4
8. close title editor with OK
9. After these steps, a file with the name of the type titlesd1917ae434a041930d0ef88c9199ec67.titlepart should appear in the /proj/projData/ directory
10. Save project as /proj/Proj1.kdenlive
11. rename /proj/ to /proj2
12 open /proj2/Proj1.kdenlive


OBSERVED RESULT
A message appears that the file /proj2/projData/titlesd1917ae434a041930d0ef88c9199ec67.titlepart was not found. But even if you click "search recursively" or even double-click on the line with the missing file and enter the path to it (although it is already correctly specified), the image in the caption clip will be missing and the editor will display a message that the file is proj/projData/titlesd1917ae434a041930d0ef88c9199ec67.titlepart not found. And there will be no way to get back to this file. You have to add the image manually.

EXPECTED RESULT
Image communication should be restored either automatically, or after a recursive search, or after manually specifying this particular file.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 18.04.2
(available in About System)
KDE Plasma Version: 5.12.8
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5