In Collections, is there a limit to the custom fields I can import?

No, you can import an unlimited number of custom fields. Custom fields can have the following attributes:

• String: any string value

• Integer: positive or negative without a thousand separator (e.g. -895)

• Boolean: any Boolean (must have a value or 0 or 1)

• Double: any double value, no thousand separator, use a period as the decimal separator (e.g., 52.2357)

• Date: any date value. Use YYYY-MM-DD format (e.g., 2017-08-29)

• Date time: Any date and time value. Use YYYY-MM-DD hh:mm:ss format (e.g., 2017-08-29 15:36:48)