Tyler Chlumecky I'm glad that your issue is resolved and thank you for posting your solution so that others experiencing the same thing can easily reference this!
Since the Microsoft Q&A community has a policy that the question author cannot accept their own answer, they can only accept answers by others, I'll repost your solution in case you'd like to Accept the answer.
Error Message:
I have uploaded a document for my Custom Translator and now I am attempting to train a model for it.
When I attempt to select my document for training, the only thing happens is that the line below select documents turns from green to red. There is no indication as to what is going on or why it has an issue, it just doesn't work.
What is going on here and is there some other log/source that I can use to help me determine what is wrong?
Solution:
All I had really done was generate additional translation lines into my target languages.
I had done so initially to meet the 10k minimum requirement but it was almost as it I needed just over 10k to get things working.
If you have any other questions, please let me know. Thank you again for your time and patience throughout this issue.