Upload a File to a project and pin it to IPFS

With this API you can upload a file to IPFS and add it to a project. You can upload the file as BASE64 Content or as URL Link or as IPFS Hash. If you submit Metadata, this Metadata will be used instead of the Metadatatemplate from the project. You can either submit Metadata or MetadataPlaceholder, but not both (because it makes no sense). The Metadata field is optional and if you dont use it, it will use the Template from your project. It is poosible to mix both versions in one project. You can have one nft with own metadata and other nfts with the template.