Welcome to BuddyDev.
1. It seems to be a css conflict. Which theme/template pack are you using?
2/3. The ‘x’ allows you to delete the content. If the media is not visible, probably the url you are adding does not provide photo/video embed type.
4. Please see this to change php maximum upload size. This is a server level configuration. MediaPress can restrict below it but not above it.
5. You may use an offloading solution for WordPress to achieve it.
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