I'm using Drupal 8 and paragraphs together, and I've got an image field attached to an image paragraph. When adding content, if I nest this inside of another paragraph (as a paragraph reference field), the file upload fails. I get the throbber gif, and then "No file chosen." If I use this paragraph type without nesting it, it works fine.
Logs and watchdog show no errors, and all other file related things (logo's, other image and file fields) work properly on their own (verified it's not a permissions or other related issue).