Thank you for reaching out to us.
The graphical content / images you upload on your site must meet the following 2 criteria:
- The size of the image must not exceed 2MB
- Image file is not corrupt.
In case any of the above criteria are not met, our system will not upload the image.
The larger the image you upload on your site, slower your website will get and eventually will negatively impact your SEO rankings. You can always use tools like: https://tinyjpg.com/ to compress the images and http://www.online-image-editor.com/ to re-size the image / change the image resolution.
Please get back to us for further assistance.