Importing Sales from a Database

I am just starting to bring the bookkeeping in house but our accountant added everything manually. We record and accept payments from our customers through an online database. When I export the CSV file to match the Sage template and import requirements, it just hangs there for hours. Even if I try and upload 1 days' worth of sales data, it won't work.

I have ensured the data fields match, the file size is not too large, and there are no errors. 

Is there a trick or am I missing something?

Edit: I am using Sage Business Cloud

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