Recently I implemented ShareExtension in my ios app built using react-native.
coming straight to the point.

added below code to info.plist of ShareExtension app to support sharing of any kind of file/attachments available

<dict>
    <key>NSExtensionActivationRule</key>
    <dict>
    <key>NSExtensionActivationSupportsText</key>
    <true/>
    <key>NSExtensionActivationSupportsWebURLWithMaxCount</key>
    <integer>1</integer>
    <key>NSExtensionActivationSupportsImageWithMaxCount</key>
    <integer>10</integer>
    <key>NSExtensionActivationSupportsMovieWithMaxCount</key>
    <integer>10</integer>
    <key>NSExtensionActivationSupportsFileWithMaxCount</key>
    <integer>10</integer>
    <key>NSExtensionActivationSupportsAttachmentsWithMaxCount</key>
    <integer>10</integer>
    </dict>
</dict>

and now I

• opened Photos

• selected an image to share

• from list of apps shown to share, I chose my app

  from the below code I got the url details but could not repeat the same while sharing PDFs

NSExtensionItem *inputItem = self.extensionContext.inputItems.firstObject;
    NSItemProvider *itemProvider = inputItem.attachments.firstObject;

    if ([itemProvider hasItemConformingToTypeIdentifier:(NSString *)kUTTypeImage]) {
        [itemProvider loadItemForTypeIdentifier:(NSString *)kUTTypeImage options:nil completionHandler:^(NSURL *url, NSError *error) {
            if (url) {
                NSLog(@"Shared file URL: %@", url);
                [self uploadFileWithURL:url];
            } else {
                NSLog(@"Error loading shared file: %@", error);
            }
        }];
    }

My trials – for sharing PDFs in the same manner,

if ([itemProvider hasItemConformingToTypeIdentifier:(NSString *)kUTTypeFileURL]) {
      [itemProvider loadItemForTypeIdentifier:(NSString *)kUTTypeFileURL options:nil completionHandler:^(NSURL *url, NSError *error) {
          if (error) {
              NSLog(@"Error loading PDF: %@", error.localizedDescription);
            } else if (url) {
              NSLog(@"Shared PDF URL: %@", url);
            }
      }];
  }

just changed kUTTypeImage –> kUTTypeFileURL

but everytime its throwing error saying

Failed to resolve item of class `NSURL` for type `public.file-url` with error: Error Domain=NSPOSIXErrorDomain Code=3 "No such process" UserInfo={NSLocalizedDescription=Cannot issue a sandbox extension for file "/Users/demouser/Library/Developer/CoreSimulator/Devices/{ID}/data/Containers/Data/Application/{SOME_ID}/Documents/PDF_NAME.pdf": No such process}

and also logging
Error loading PDF: Could not coerce an item to class NSURL

what I want ——> I just want to share the pdf file just like the image(which is working fine)
IF anybody have any prior experience, do kindly share, it will be very helpful.