Can I upload invoices from different platform? excel file or just pdf invoices?

You can use the importer tool to import invoices data from Excel

https://get.transactionpro.com/qbo

Hello hellboundwelding. It's great to have you join us in the Community again. I'll be glad to share infomarmation about uploading invoices into QuickBooks. You can upload invoices from a different platform by clicking on the Gear icon > Import data > Import data. You can upload data from any platform that has the .CSV Excel format. In the meantime, let me know if you have questions. I'm here to assist.