Thanks for the reply.
Sorry about that,
It is difficult to give the necessary information because we do not know the cause of the problem.
Keep the questions coming, please.
I have finished the tutorial on catgifs.
I placed a breakpoint in the catgifs php program though,
It is not stopping.
The path mapping looks like the image.
また、以下の質問を参考にしています。
以下のコマンドは実行しています
./php-mod-config nextcloud xdebug.mode debug