"Last Modified" property of file changes after Upload

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This question was closed Aug 19 at 04:35 PM by Levon@Amazon for the following reason: Please post in Amazon Digital and Device Forum

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kotsak asked · Oct 19, 2017 at 03:30 PM

"Last Modified" property of file changes after Upload

Hi everyone,

I've just realized today that after uploading a new file into Amazon Cloud Drive, its Last Modified timestamp will be altered due to, what it seems, a post processing for certain file types (e.g. Word documents, text file, etc).

Uploading a new file will return a JSON response with all the file properties/metadata including the Last Modified timestamps as the API says. The problem now is that requesting the metadata for the file we've just uploaded (using GET : {{metadataUrl}}/nodes/{id} ) will return a different Last Modified timestamp, usually a few seconds after the Last Modified timestamp we received from the Upload method. Additionally a new property ("properties":{"CloudDrive":{"Processing":"PDF_PROCESSED"}}) appears in the file's properties which makes me suspect that the file properties have been updated right after my upload thus modifying the Last Modified timestamp. This causes a huge problem since the Last Modified timestamp I receive from the Upload is now invalid as it is not correct anymore.

Why is the Last Modified timestamp being changed at all as the file is not being changed? If it's due to the property change can there be an exception to NOT update the timestamp since it's being done by the cloud service which is something we cannot control?

Thanks, Kostas

amazon drive

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Answer 1 · 2015-11-24T14:52:20Z

Jamie@Amazon answered · Nov 24, 2015 at 02:52 PM · ACCEPTED ANSWER

Hey guys, This is still intended behaviour. I'll pass your feedback on to the team anyway to see if there is something we can do, but I cannot promise any changes at this time. Thanks! Jamie

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Answer 2 · 2015-07-16T20:10:39Z

brittle81 answered · Jul 16, 2015 at 08:10 PM

I second this question. Our application depends on modifiedDate and spontaneous changes of modifiedDate (not related to user activity) make it hard to do any sync.

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Answer 3 · 2018-10-18T07:48:36Z

Geir answered · Oct 18, 2018 at 07:48 AM

Is this resolved. I am looking for a cloud storage for backup

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Answer 4 · 2017-11-10T16:39:40Z

NewUser-c7ca8576-8f41-449d-8bec-923f38a800b7 answered · Nov 10, 2017 at 04:39 PM

This problem has been going on for years now. I have tried both goodsync and syncback and the net results is to jump thru hoops to make backups. if I simply automate the process, it will effectively do a complete back up daily, which means i NEVER stop doing full backups. couldn't figure out why i was always copying 32000 files every day, some are big files, and it runs 28 hours, EVERY DAY.

Goodsync has a work around, but it's a pain in the butt. Since this has been going on for years with promises to 'look into this' and it's still not fixed, i'm moving to a different backup solution as i can't have my system spending all it's resources all the time doing backups.

A normal back up should take 30 min. I talked to both tech supports from GS and SB.. And they need the time stamp to match files across drives and they both agree they can't simply add an option to 'ignore timestamp' as it will cause many more problems than the one it fixes.

Amazon screwed us already by doing unlimited, then took it away, and add in the timestamp problem, Amazon isn't the great deal it was before. Ample other solutions including MyCloud from WD, I put in a 3TB drive in the basement, it's readable from anywhere and you control your own files. I make the redundant backup there every day and it's usually 15 min. For my offsite, i'll find a different option that appreciates the importance of timestamps and doesn't screw with them.

Mostly love everything Amazon, but this one fails.

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Answer 5 · 2017-09-06T19:33:03Z

Tabasko answered · Sep 06, 2017 at 07:33 PM

Hi, I have the same problem ! Looks like Amzon don't care about the situation as the previous message are really old.

Tested on google drive, I don't have the issue using my Sync software.

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Answer 6 · 2017-05-14T06:28:44Z

philippe answered · May 14, 2017 at 06:28 AM

Any update on this? I'm currently uploading TB of data over and over continuously for the past few monthsas the "last modified" timestamp of many of my uploaded files are being changed after being uploaded. As other users have explained, back up applications rely on the timestamp difference to trigger files backup. Will most likely have to pass and stay with LiveDrive.

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Answer 7 · 2015-12-20T21:44:14Z

Pells answered · Dec 20, 2015 at 09:44 PM

+100 on this. This is crazy that the file date changes. None of my syncs work. Just causes me to upload more data to Amazon...I am sure that isn't what you want.

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Answer 8 · 2015-11-12T16:39:16Z

Virtude Livros answered · Nov 12, 2015 at 04:39 PM

Guys, any answer on this? I bet it´s a "must be fixed issue", since most 3rd part apps are not working accordingly.

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Answer 9 · 2015-09-07T20:48:46Z

Steven Mair answered · Sep 07, 2015 at 08:48 PM

+100 on that. This makes AMZN Cloud Drive virtually useless for all non-media storage. Many apps - esp. backup or sync apps - depend on modification times to determine coherency - at least as a first indicator. If you cannot depend on the mod time being reliable, then the only way you can ensure a file is not changed is by running some sort of checksum on the file (e.g. MD5). This is a) very slow and b) uses a lot of filesystem and network bandwidth. In the case of b) this is a detriment to AMZN as well as the user.

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Answer 10 · 2015-08-07T16:36:35Z

Juan P. Bretti Mandarano answered · Aug 07, 2015 at 04:36 PM

+1 on the request of having a coherent "modifiedDate".

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"Last Modified" property of file changes after Upload

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