SF: receiving object for file upload in Salesforce

1. Use attachment to upload files:
   

   1. The uploaded content is stored in the attachment object of SF.

2. Use the <Apex: inputfile> component to upload files:

   1. The uploaded content is stored in the Document Object of SF.

3. Use the library in the content app in SF to store the content file:

   1. The uploaded files will be stored in the contentworkspace object (Library) and contentversion object (content) for specific file content (including binary files, etc. However, it requires a contententid .).

   2. Contentdocument object, which cannot be created manually. Method 3: After the file is uploaded, the corresponding contentdoucumnetid is automatically generated.

Note: use of content app:

First, check the three check boxes: salesforce CRM content user, receive Salesforce CRM content email alerts, and receive Salesforce CRM content alerts as daily diges, set to true.

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