Welcome, @Stephanie_Dv
You can use the Custom Reference Genome function for your genome. This will work just like native server index that happens to be available.
We had another question about this today where I provided all the details, plus a fresh example of the data preparation steps. This should work for you, too!
Please see → Inquiry about lettuce genome
Other similar topics can be found with the tag custom-genome
Hope this helps! 