What are the limitations of Export Transaction Attachment REST API in Oracle CPQ.

Summary:

We wanted to use Export Transaction Attachment REST API to import attachments from one transaction to Another transaction, so having some questions as below:
1. What all File types are supported e.g. .pdf, .word, .rtf, .excel etc.

2. What is the size limitation of the attachment file.

3. How many transaction attachments can be processed, any limitation on number of attachments.

Content (please ensure you mask any confidential information):

Hello Folks please assist me finding the answers of above questions.

Version (include the version you are using, if applicable):

CPQ 24C Patch 4 Version

REST API Used:
/rest/v17/commerce{Stage}{ProcessVarName}{MainDocVarName}/{id}/actions/{exportAttachmentActionVarName}