IOS – Is it possible to upload files to a website from Safari on iPhone

iOS apps can only read data in their own directory and thus only Safari would be able to use these files - so how could you create them and put them in Safari's directories?

From Apple's Filesystem basics development documentation

An iOS app’s interactions with the file system are limited mostly to the directories inside the app’s sandbox. During installation of a new app, the installer code creates a home directory for the app, places the app in that directory, and creates several other key directories. These directories constitute the app’s primary view of the file system. Figure 1-1 shows a representation of the sandbox for an app.

Figure 1-1 Each iOS app operates within its own sandbox

Because it is in a sandbox, an app is generally prohibited from accessing or creating files in directories outside of its home directory. One exception to this rule occurs when an app uses public system interfaces to access things such as the user’s contacts or music. In those cases, the system frameworks handle any file-related operations needed to read from or modify the appropriate data store

No, you can't do this unless the website allows it. The uploaded file will use the name of the file that you uploaded, and on iOS this is always image.jpg.

You can provide feedback to Apple regarding this at the following page:

• http://www.apple.com/feedback/safari.html