Exceeding Aggregate limit for form XML size

I'm having trouble uploading forms to aggregate. I know that the size of the form is the problem file is very large (more than 17 MB), because more than 8,xxx choices.
What is the limit for the size of a form or not?

Hi @Chonticha

do you keep all those choices in your xml form or in a separate csv file?

@Grzesiek2010 Thank you for your reply, I keep all choices in xml form.
Would you recommend what I could do?

I don't know what aggregate limits are but to solve your problem you can try to keep your choices in a separate csv file: http://xlsform.org/en/#external-selects

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@Grzesiek2010 Thank you for your recommendation.

Now I can use the external_choices but I have question about 'minimal', Do you have a setting appearance-minimal If using external_choices.