Pictures are not displayed after CSV import in prestashop

Multi tool use
Pictures are not displayed after CSV import in prestashop
I spent several hours searching for my problem, unfortunately without success, should I have missed a topic, I would be grateful to post the link.
I have a CSV file which in the column "URL images" in each case the complete path https://path.to/alternative/picture.jpg, https://path.to/alternative/picture_1.jpg, ect) entered becomes. The absolute path of the images when CSV is correct, I can also access the images in the browser.
When I import the CSV, I do not get any error message, as soon as I look at the product I see the following:
No Product-Picture
Prestashop Version 1.7.3.0. An update from Prestashop not possible that the purchased modules and also templates are not compatible.
I hope somebody can help me.
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