Struts 6.3 Issue Uploading Files

Hi Guys, We are unable to upload files to our first 6.3 application using HTTP requests, but the strange thing is they work with ajax requests. I suspect we are overlooking something in the config which is required in 6.3. We are using 6.3.0.2 running on Tomcat 9. The file object is null

Re: The absolute uri: [http://tiles.apache.org/tags-tiles] cannot be resolved

Hi I am doing a struts2 upgrade to struts 6.3.0.2. When I am uploading a file I am getting java.lang.noclassdeffounderror: could not initialise class org.apache.poi.ooxml.poixmltypeloader. I am using poi-5.2.5, poi-ooxml-5.2.5 and poi-ooxml-lite-5.2.5 jar files. Please advise. Thank you. Regards M