Downloading files in a shared folder

To interact with files in a folder via a shared link to that folder, you shouldn't modify the shared link. You should instead use the API options to specify the relative path of the file inside the folder. Here's some example code showing the different things you can do:

// this shared link is for a folder
String sharedLinkUrl = "https://www.dropbox.com/sh/sm8nzbmxo1khsb7/AAAYre26ySxEvrnLzvKMYOvma?dl=0";

// to get the metadata for a shared link:
System.out.println(client.sharing().getSharedLinkMetadata(sharedLinkUrl));

// in this case, there's a file named "test.txt" in the linked folder:
String relativeFilePath = "/test.txt";
// to get the metadata for a file in a folder from a shared link for the folder:
System.out.println(client.sharing().getSharedLinkMetadataBuilder(sharedLinkUrl).withPath(relativeFilePath).start());

// or to programmatically list the contents of a folder from a shared link for the folder:
System.out.println(client.files().listFolderBuilder("").withSharedLink(new SharedLink(sharedLinkUrl)).start());
// be sure to implement listFolderContinue too

// to download a file in a folder from a shared link for the folder:
System.out.println(client.sharing().getSharedLinkFileBuilder(sharedLinkUrl).withPath(relativeFilePath).start());