I agree with you.
You see my problem clearly about difficulties when making questions with those many images.
I find to use the gwenview application for selecting the right images for the approppriate questions.
I have prepared images of signs and corresponding textual descriptions for those images, and their names are like: image_01.png image_01.png.txt and so on.. Names of images gives me clue what they represents, and have organized those images in subdirectorties which corresponds to traffic sign subcategories.
It remains to me just clicking in Moodle when adding new questions in to question bank.
It would be better if the file picker opens each repeated time in the previously opened directory at previous question creation.
So, I must now just do my job and create Multiple-choise type of questions, and after that the Quiz.
Thank you once again for support.