General Web Question - Image Upload Website Connection Fails

Curious thing...
Using Tablet on WiFi - connected...
I can upload an image etc...
But it seems when I am on 4G - it will not upload an image and times out - saying website connection lost...
I know this is vague - but I'm perplexed... As the other sites on the tablet run fine...
The upload image portion is a popup screen...
So wondering if I'm having connectivity problems or what...
Thx...
Marlin

If you are talking about a JEE application or any application that uses the HTTP protocol and HTML (XHTML too), no it is not possible to upload an entire folder at once just by naming the folder. All you can do is let the user identify individual files to be uploaded, though you CAN have more than one file uploaded in a single submission.
This is a security feature of HTTP and HTML - nothing gets uploaded that the user didn't EXPLICITLY name. It protects you from having websites steal data from your computer without your knowledge and permission. This is enforced by the browser.
Can you get around this? Yes, there are a few ways. Instead of writing a web application that uses HTML, you could write a Java applet. When an applet runs, the user must give it permission to run - since it is actually executing on the user's machine, not the server. When it tries to do certain tasks with security implications, like access the user's file system, the user must again give permission. The user can choose to be asked every time, or give permanent authorization. But at that point the applet can do anything that any application on the user's machine can do.
Or you could configure Web Distributed Authoring and Versioning (WebDAV) on your web server, which extends the HTTP protocol to allow users to read and write files on certain DAV-enabled folders on the web server. Windows Explorer knows how to connect DAV-enabled websites as if they were file servers. Oracle also provides a few ways to use DAV to upload and download data to and from the database, through XMLDB and through the OraDAV module of Oracle Application Server.

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