The file path is case sensitive on Linux. Do not forget to specify the correct cases in your csv.
As mentioned in blakcaps, the image value, small_image and thumbnail should always start with a slash. Say if the path of your image is "public_html / media / import / myfolder / Abc.jpg", it should look like the one in your csv file.
sku, image, small_image, thumbnail sku_abc, /myfolder/Abc.jpg, /myfolder/Abc.jpg, /myfolder/Abc.jpg
And do not forget to grant read / write permission to your web server in the "media" folder.
Joe hong
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