International Amending 2024 Tax Return
I am an international student, and my school wants us to use Sprintax for taxes. That said, I got a Schedule K-1 in 2024, so I couldn't file via Sprintax. I went on to look for an accountant, who filed late (after the extension) and incorrectly (he filed everything as if I were a permanent resident, even though I explicitly explained my situation multiple times and told him exactly which forms to file).
I have since discovered OLT, which is great, and I filed my 2025 return with them. However, I just realized they don't file amended returns if the original accepted return wasn't filed with them. I'd prefer not to look for another accountant (at least the previous one didn't charge me much, given all his mistakes). My documents include a W-2, 1040-NR, Schedule K-1, 1042-S, and trading statements if needed.
I am really unsure of what to do now.