Errors and info 
Author: Luca F.
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in analyse and optimize, there are errors, alert and info, some is simple to fix but how to fix the: object not included in Site Map xml - (how to fix)
picture file is too big, I thaught that X5 automatically optimized photo for the web site
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Luca, assuming the object is an image you can simply add it to the sitemap (along with other details). Most objects can be added if this is necessary.
As for images that are too big you can manually resize files individually or run optimizer available here https://www.websitex5.com/en/utility.html
Website X5 will display images correctly, but it generally does not resample and resize the actual image.
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how to solve : the robots,txt file is missing in this project.
also when i try to add a video to sitemap i get a request for a preview image, no idea where to get it