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Raja Bhandari 16Raja Bhandari 16 

how to restrict upload of file in salesforce for only Account object and only pdf files ?

Raj VakatiRaj Vakati
Try this code
  
trigger CheckAttachmentName on Attachment (before insert) {
    for (Attachment att:Trigger.new)
    {
        String parentObjId = att.ParentId;
        if(!parentObjId.startsWith('001') && !att.Name.toLowerCase().contains('.pdf'))
        {
            att.addError('Cannot upload file with name containing ');
        }
    }
    
    
}