A row is red and says it couldn't be read.
In Rhodes: Processing
Stuck rows sort to the top and carry the reason. Use Retry on the row, or Retry all stuck to take another pass at everything at once — worth trying first, since most failures are transient. If the reason says Couldn't find this file, retrying won't help; upload it again.
A document Rhodes split into pieces has no Retry. Cancel it and upload the file again.
If a retry doesn't clear it, Cancel takes it off the list, and you can upload the file again or send it to support@rhodesoffice.ai.