selecting a chime in Caynax Hourly Chime In Caynax Hourly Chime when I select chime option a dialog with a Search button appears. But while I have some sound file in my SD it do not show them. How can I choose chime file in this app?
You need to place your audio files in the correct directory structure, as I explained in this answer:

There are special directories you can use to store your custom "noises". The "starting point" (root-of-noises-dir) may be different between devices (so this is rather a generic answer, as I do not own all of them) -- pick one and check if it works, if not, pick the next:

/sdcard/media/audio
/sdcard/media
/sdcard


In there, put the directories for the specific events:

┌───────────────┬───────────────────────┐
| directory     | description           |
├───────────────┼───────────────────────┤
| alarms        | for your alarm clock  |
| notifications | for... notifications? |
| ringtones     | for incoming calls    |
| ui            | keyboard click etc.   |
└───────────────┴───────────────────────┘


Then place your sound files into the appropriate directories. Done. Now you should be able to pick them in your configuration(s).

Alternatively, for an easy, non-techy way, you might want to take a look at the Ringdroid app (a Howto can be found e.g. at MakeTechEasier).