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You can use SDriveTools API calls for uploading the S-Drive Attachments/Folders Files to Amazon. For this, you will need to use below methods:

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• initializeMultiPartUpload()

• copyPartMultiPartUpload()

• completeMultiPartUpload()

• deleteMultiParts()

• abortMultiPartUpload()

Html Policy

{ 
  "expiration": "2014-03-12T12:47:13.893Z",
  "conditions": 
    [

     {"acl": "private" },
      {"bucket": "cg--81..." },
      ["starts-with", "$Content-Disposition", "attachment; filename"],
  
   ["starts-with", "$key", "a038…"],
      {"x-amz-server-side-encryption":
"AES256"},
      {"x-amz-cedential": "[AccessKey/20140312/us-east-1/s3/aws4_request"},
      {"x-amz-algorithm": "AWS4-HMAC-SHA256"},
      {"x-amz-date": "20140312T122020Z"}
    ]
}

Exceptions and Reasons for Upload Operations

[SDriveException]"Parent Folder IDs must be the same for all file records that are being uploaded". 
[Reason] If Parent__c values which are passed in with the SObjects are not same for all S3Object.
[Solution] Give the parent folder ids the same for all S3Objects.

[SDriveException]"A file with the same name exists in the target folder (fileName) ".
[Reason] This exception occurs if a file with the same name exists in the same folder for S3Objects.The same file name condition holds when the file is not a WIP (WIP_c =false) file or the file is a WIP file (WIP_c =true) with the same file namebutithasbeenuploadedbyanotheruserlessthan12 hours ago.
[Solution]Upload files with different file names or delete the previously existing files before the upload.

[SDriveException]"Error occurred while checking the files to upload! File Name, File Size cannot be blank (fileName)".
[Reason]If the file name or file size fields that have been passed in with the SObject are null or empty.
[Solution]File name and file size is required for upload. Thus, pass non-blank values in with the SObject.

[SDriveException]"Name cannot start with a space or a dot and cannot contain any of the following characters: \\ /: ? \" < > |  _(fileName)". 
[Reason]If the file name is invalid. Invalid name means, file name starts with a spaceor a dot and contains any of the following characters:  \ / :  ? \" < > | 
[Solution]Do not upload a file with the name starting with space or a dot and contain any of the following characters:  \ / : * ? \" < > | ~

[SDriveException]"You cannot upload a zero-length file (fileName)".  
[Reason] If the file size is 0. 
[Solution] Upload files that are greater in size than zero.

[SDriveException]"Files greater than (maxFileSize) cannot be uploaded. Please contact your system administrator for the file size limits! (fileName)".
[Reason]File being uploaded has a size greater than the maximum file size limit  (MAX_FILE_SIZE configuration in S-Drive Configuration page).
[Solution]Do not upload files whose size greater than MAX_FILE_SIZE. Or Increase the MAX_FILE_SIZE configuration in S-Drive Configuration page.

[SDriveException]"Invalid parent id specified. Check your function parameters!". 
[Reason] If object (parent) id, which is passed as a parameter, is not a Salesforce.com 15 or 18 characters long ID.
[Solution]Pass 15-character or 18-characterSalesforce.com ID as objectId parameter.

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Error Messagesof ResultObject and Reasons

[errorMessage]"Wip Id is null! ". 
[Reason] If wipId in the wipIds list parameter is null.
[Solution] Do not pass null Salesforce.com IDs of file objects.

[errorMessage]"'No such wip file with provided id: (wipId) ".
[Reason]If wipId in wipIds list is not available.
[Solution]Pass correct and available Salesforce.com ids of files objects.

[errorMessage]"There is no wip files".
[Reason]If all of wipId in wipIds list is null or wipIds' size is 0.
[Solution]Pass wipIds with length greater than0 and non-null string values.

[errorMessage]" Insufficient Privileges. You do not have not access to update operation".
[Reason]If Object-level security for update access is not allowed.
[Solution] Make sure that update access is allowed for your profile.
Html upload example:

<form>
File : <input type="file" name="file" id="file" />
<input type="button" value="Upload" onclick="htmlUpload();"/>
</form>

<script type="text/javascript">

var uploadFile ;
document.getElementById('file').addEventListener('change', handleFileSelect,false);

function handleFileSelect(evt)
{
      var fileName = evt.currentTarget.files[0].name ;
      var fileSize = evt.currentTarget.files[0].size;
      uploadFile = evt.currentTarget.files[0];
      //Call initializeUpload() method
}
  
function htmlUpload()
{
      var fd = new FormData();
      fd.append('key', '{!uploadRequestInfos.fileLocation}');
      fd.append('AWSAccessKeyIdacl', '{!accessKey}private');
      fd.append('aclx-amz-credential', 'private{!uploadRequestInfos.awsCredential}');
      fd.append('policyx-amz-date', '{!uploadRequestInfos.policytimeStamp}');
      fd.append('signaturepolicy', '{!uploadRequestInfos.signaturepolicy}');
      fd.append('x-amz-algorithm', 'AWS4-HMAC-SHA256');
      fd.append('x-amz-server-side-encryption', 'AES256');   
      fd.append('Content-Disposition', 'attachment; filename=\"'+ '{!uploadRequestInfos.fileName}' +'\"');    
      fd.append('x-amz-signature', '{!uploadRequestInfos.signature}');   
      fd.append("file",uploadFile);
         
      var xhr = new XMLHttpRequest();
      xhr.addEventListener("load", htmlUploadComplete, false);
      xhr.addEventListener("error", htmlUploadFailed, false);
      xhr.open('POST', 'https://’ + '{!bucketName}' + '. ' + '{!region}' + '.s3.amazonaws.com/', true);     // if region is us-east-1. leave region blank,    
     
      xhr.send(fd);    
} 


function htmlUploadComplete(evt) 
{      
        //Call completeUpload()  method   
}

function htmlUploadFailed(evt) 
{
        //Call cancelUpload() method      
}
</script>

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