Forum Discussion
Search for files across multiple SharePoint site collections and their subsites
We have a custom .NET web application that will be connecting to SharePoint over SharePoint's API primarily to store documents in SharePoint and take advantage of the document management functionalit...
Yes, you can use the search rest API
https://docs.microsoft.com/en-us/sharepoint/dev/general-development/sharepoint-search-rest-api-overview
Search can crawl information from your entire tenant, so you shouldn't have problems by having multiple site collections
https://docs.microsoft.com/en-us/sharepoint/dev/general-development/sharepoint-search-rest-api-overview
Search can crawl information from your entire tenant, so you shouldn't have problems by having multiple site collections