I am looking for a software to clearly display my orders together with the invoices, delivery data and usage purposes. Since I order quite a lot, it would also be helpful if the invoice could be uploaded to the appropriate items. In addition, the "software" must be accessible and synchronized from several devices, i.e. preferably web-based and self-hosted.
My problem at the moment is that you can only find software for the seller side and not for the buyer side.
Does someone have a suitable software to think of?
I am grateful for every suggestion, even if it doesn't quite meet my expectations.