Sketchbook Security

[Whimsicaltwigs]

Hey, I'm fairly new here and I understand that some threads/posts need to be seen by a mod first to avoid spam. But I don't know if it's that or am I doing something wrong? I don't seem to have a problem posting or replying to other's threads, but I can't seem to add attachments to my sketchbook. I'm not sure if it has to be approved first because I posted it a few days ago but whenever I try to upload sketches it says something about a security bot...
If I'm doing something wrong, please let me know and I'll figure it out. Thanks!