There is currently no native way to combine multiple reports into a single PDF file in Dynamics 365 Business Central. However, there is a solution using an Azure Function that allows you to pass a JSON array of documents to merge and gives you a merged PDF document as output. The Azure Function is written in .NET Isolated with a free and open-source library. You can call the Azure Function directly from AL code in Dynamics 365 Business Central using a POST request. The code for the Azure Function is available on GitHub. If you need to merge a large number of files or files with a large size, it is recommended to use Azure Blob Storage as a repository.
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