Display information/warning when users try to upload a too large file about palma HOT 9 CLOSED

I see your point and agree, but on the other hand users might not have larger files reachable through URL. As wagneral pointed out, a notification and perhaps an explanation/recommendation when to use what sharing method with what kind of files could be helpful.

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Information is already displayed, but only half a second visible. We should add a delay, so the user has the chance to realize what's happening.

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We should perhaps increase the MaxUploadLimit or at least show some kind of notification (e.g. a message box) informing the user about the upload limit

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It looks like this is a general problem with uploads of files larger than the upload limit (configured for PHP), so I suggest to update the title of this issue.

I vote against increasing the upload limit to a much higher value, because I think that a large upload time is not acceptable. Users can still display large files when they are available via a URL.

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Came across some Dropzone lines, that are responsible for file preview and also for warning users if files are to big. This functionality has been disabled: https://github.com/UB-Mannheim/PalMA/blob/master/index.php#L1216
Perhaps it can be reactivated when adding a tabbed view and updating Dropzone JS

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Reactivated in testing branch: a15a5b7#diff-828e0013b8f3bc1bb22b4f57172b019dR1294

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BTW max_filesize for uploading a file is 256MB

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Simple js alert box added. Works.

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How long does it take to upload 256 MB via a wireless connection? For typical 57 MBit / s connections, maybe 4 MB / s is realistic, so the total time would be 64 s or about 1 minute. Is that acceptable?

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