Real upload interface and configurable parameters

**Is your feature request related to a problem? Please describe.**
The current data upload panel is simply transferring the text to the front end, which has many limitations. The interface requires a real upload tool with basic functionalities.

On the other hand, it would be nice if some of the configurations of the upload tool can be customized. One example includes changing the file upload limit of the tool.

**Describe the solution you'd like**
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**Describe alternatives you've considered**
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**Additional context**
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Start by locating the current data upload panel and tracing how it transfers text to the front end. Define the required real upload behavior and configurable parameters, including the file upload limit, before implementation; done means the panel supports basic upload functionality and its limits can be customized.

Written by the indexing model from the issue text.