Justin Conover

GTF and GFF3 files are largely identical to each other (gff3 is a newer version of gtf), and [here's](https://www.ncbi.nlm.nih.gov/genbank/genomes_gff/#:~:text=The%20GFF3%20format%20is%20better,use%20for%20submission%20are%20similar) a good link describing them with links to some example files....

Thanks for your update @JosephLalli, but this unfortunately doesn't solve the issue I described. Even producing the gam files stalls, so I think your and my issues are maybe separate...