It's because you gave the images a file extension of "JPG" (capitalised) instead of the conventional "jpg" (lowercase). <...> As a general principle on webserver you should not use uppercase letters, special characters, or spaces in file names.Files are saved exactly as a poorly educated Site Editor would copy. )
<...> you would have to start again from scratch. Please also note that this will require some complete PHP, TWIG, HTML, SCSS and good knowledge of the inner working of Joomla to achieve. Nevertheless, good luck with that.General knowledge is enough; the problem is in sufficient free time.
Perhaps, I will try to understand the ways of creating Particles not earlier than Christmas and New Year holidays...
Mark, thank you so much!
Your answers are always both helpful and inspiring to new knowledge and creativity.
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