Hi Gabriel,
Thank you for using Syncfusion products.
Based on the provided information, we suspect that you have set up an ASP.NET Web API for JS Spreadsheet with ‘Syncfusion.JavaScript’ NuGet package. This package will install only the Scripts, Styles and Themes for JavaScript Platform controls. Hence the dependency assemblies required for your project will be unavailable. Please refer the below KB link for more information,
And, we would like to suggest you to use the ‘Syncfusion.AspNet’ NuGet package for getting the all dependent assemblies for building Web API to perform Spreadsheet Import/Export functionalities. Meanwhile, we have prepared 2 projects (Spreadsheet sample & SpreadsheetWebAPI) to demonstrate your requirement and the same can be downloaded from the following link,
Could you please check the above samples and get back to us if we misunderstood your requirement so that we can analyze based on your scenario and provide you better solution quickly? The information provided would be a great help for us to resolve this issue.
Regards,
Silambarasan I