Of course not! There are many options to get your products into ecomdash.
Within ecomdash, you can navigate to Listings > Download Listings where you can select a storefront to download listings from. Initiating a listing download will allow ecomdash to look for new SKU's on the selected storefront to bring into your inventory as well as check on the listing status of your listed items. Note: Listing Downloads will not overwrite any information, it will only bring in new in.
If you would like to upload products from a .CSV file, you can do so using the process in this guide.