Syncee can upload product images only if their URL is in the data feed file.
However, you do not have the URL in the file, you can use Syncee's features to upload it to your store.
1, Upload all product images to your store's file section
2, Copy the first part of the URL which precedes the name of your image. For example here the name is ecommerce22.jpg, so we have to copy the link before it.
3, Paste it into Syncee's Prefix field in the Field Mapping
4, Run the task and you are done!