Hello Thiam,
The described scenario is impossible to achieve with standard HTML and Javascript, due to the following restrictions:
2. Some browsers do not provide information about the file size on the client, so client validation is not always possible.
3. Javascript does not have access to the file system, so it cannot read existing files or save new ones.
4. Browsers can upload only files, which have been explicitly and manually selected by the user via the popup dialog.
Greetings,
Dimo
the Telerik team
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