You can add extra terms for the upload. That would constitute an EULA for your website, not your app. In general, jurisdictions assume that users of a free service get only limited rights. There are specific exceptions, however, and for that reason alone you might want to state explicitly in your website EULA which jurisdiction applies (yours, presumably).
Furthermore, you should clarify the copyright status of submitted content. Again, there's a common pattern: submitter retains the copyright, but grants you a perpetual, irrevocable, non-transferable license for use of the submitted content on your website.
When you set up your app for submission in iTunes Connect, you have the opportunity to set a EULA. Apple also provides a template EULA to get you started which is also available in the area where you edit your EULA.
As for protecting yourself based on what you have asked, you should probably seek legal advice.
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您可以添加额外的上传条款。这将构成您网站的 EULA，而不是您应用程序的 EULA。一般来说，司法管辖区认为免费服务的用户仅获得有限的权利。但是，也有特定的例外情况，仅出于这个原因，您可能需要在您的网站 EULA 中明确说明适用哪个司法管辖区（大概是您的管辖权）。
此外，您应该明确提交内容的版权状态。同样，有一个常见的模式：提交者保留版权，但授予您在您的网站上使用所提交内容的永久、不可撤销、不可转让的许可。
You can add extra terms for the upload. That would constitute an EULA for your website, not your app. In general, jurisdictions assume that users of a free service get only limited rights. There are specific exceptions, however, and for that reason alone you might want to state explicitly in your website EULA which jurisdiction applies (yours, presumably).
Furthermore, you should clarify the copyright status of submitted content. Again, there's a common pattern: submitter retains the copyright, but grants you a perpetual, irrevocable, non-transferable license for use of the submitted content on your website.
当您设置应用程序以在 iTunes Connect 中提交时，您有机会设置 EULA。 Apple 还提供了一个 EULA 模板来帮助您入门，您也可以在编辑 EULA 的区域中找到该模板。
至于根据您的要求保护自己，您可能应该寻求法律建议。
When you set up your app for submission in iTunes Connect, you have the opportunity to set a EULA. Apple also provides a template EULA to get you started which is also available in the area where you edit your EULA.
As for protecting yourself based on what you have asked, you should probably seek legal advice.