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REVNAREVNA 

ContentVersion PDF Type

I am using below code to create a File in Apex and attach it to one of the LEads. 
The PDF file type does get attached . But when I preview it / Download it - there are errors. 
"Preview not available" OR "Error loading Files". 
Any idea what mistake I am doing ?  
Blob yourFiles = Blob.valueOf(‘MONDAY TUESDAY WEDNESDAY THURSDAY FRIDAY’);
ContentVersion conVer = new ContentVersion();
conVer.ContentLocation = ‘S’;
conVer.PathOnClient = ‘test’+’.’+’pdf’;
conVer.Title = ‘Sample’;
conVer.VersionData = EncodingUtil.base64Decode(s);
conVer.origin = ‘H’;
insert conVer;
Id conDoc = [SELECT FileExtension ,ContentDocumentId FROM ContentVersion WHERE Id =:conVer.Id].ContentDocumentId;
ContentVersion cv =
[SELECT Title, FileExtension, VersionData, ContentDocumentId,
ContentLocation, FileType
FROM ContentVersion
WHERE ContentDocumentId = :conDoc
AND IsLatest = true];
//Create ContentDocumentLink
ContentDocumentLink cDe = new ContentDocumentLink();
cDe.ContentDocumentId = conDoc;
cDe.LinkedEntityId = ‘XXXXXXXXX’;
cDe.ShareType = ‘I’;
cDe.Visibility = ‘InternalUsers’;
insert cDe;

 
REVNAREVNA
ContentVersion conVer = new ContentVersion();
conVer.ContentLocation = 'S';
conVer.PathOnClient = 'test930.pdf';
conVer.Title = 'Proposal1Tuesday10';
conVer.VersionData = Blob.valueOf('Test Content');
conVer.origin = 'H';
insert conVer;
Id conDoc = [SELECT FileExtension ,ContentDocumentId FROM ContentVersion WHERE Id =:conVer.Id].ContentDocumentId;
ContentVersion cv =
[SELECT Title, FileExtension, VersionData, ContentDocumentId,
ContentLocation, FileType
FROM ContentVersion
WHERE ContentDocumentId = :conDoc
AND IsLatest = true];
//Create ContentDocumentLink
ContentDocumentLink cDe = new ContentDocumentLink();
cDe.ContentDocumentId = conDoc;
cDe.LinkedEntityId = '00Q7A000004eSiUUAU';
cDe.ShareType = 'I';
cDe.Visibility = 'InternalUsers';
insert cDe;

Sorry I am using this code. And the PDF that is getting generated does not give me a preview. Nor has anything in it when I download it. 
But when I open the pdf on my machine as TXT , it does have the content in it as - "Test Content".