Same thing happened to me when I first joined, not to worry, no need to upload again, no need for approval. It will come back just give it a little time, Steemit is a decentalized transparent platform, because of these qualities the web spiders need to go through each page from time to time as all posts are public and therefore search engines need to scrape them to collect info, so especially pictures all go pic files for faster reference. Also from time to time this blockchain will fork with new changes that sometimes have unforseen outcomes. Welcome just sit back relax and watch your value grow, cheers.