Q: Is Sku Fetch able to upload items to Ecomdash?
A: No. Please note that Sku Fetch does not upload items into eCom Dash. Sku Fetch + Whichever option you choose to list to eBay with (i.e. Wise Lister, eBay Selling Manager, eBay File Exchange) would list products to eBay for you. Sku Fetch would then export the item information to your linked Sku Grid account. Since you have your sku grid account set up to sync with eCom Dash, it would be Sku Grid that would then send the item information to eCom Dash for you.
Sku Grid would check your supplier urls and send revision information to eCom Dash which would then sync changes to your eBay listings.