function readOnly(count){ }
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You can try using 'lightning:fileUpload.
Reference:
https://developer.salesforce.com/docs/component-library/bundle/lightning:fileUpload/documentation
https://sfdclesson.com/2019/06/23/%E2%9A%A1-lightning-file-upload-with-a-title-using-lightningfileupload/
Thanks,'