Hello,
we are trying to import an excel data from external system into dynamics crm using a custom button "Import external data" on a custom entity form. out of box excel import won't work for us. Also, we have explored the option of custom button invoking a plugin where a global action can pass the excel data to plugin but here we ran into issue with third party DLLs for excel and plugin registration. ILMerge is not recommended as well. So, only option we are trying is, create a custom API so that action can call the custom API and pass the excel data. please throw some details on this custom API approach. Ideas, pointers, existing posts would really help. Thanks!
