Created attachment 204207 [details] Sample PPTX The attached PPTX file contains a simple SmartArt, with a link to another slide, and an external one. Open and save it back to PPTX, then try opening it in PowerPoint: it will fail. The problem is 'ppt/diagrams/_rels/*.rels', or precisely, the lack of them, as can be seen after unzipping the result PPTX. Inside eg. 'ppt/diagrams/data1.xml' the links are stored as follows: - external <a:hlinkClick xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" r:id="rId1"/> - internal <a:hlinkClick xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" r:id="rId2" action="ppaction://hlinksldjump"/> These would need corresponding Relationship elements in 'ppt/diagrams/_rels/data1.xml.rels': <Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/slide" Target="../slides/slide2.xml"/> <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/hyperlink" Target="https://libreoffice.org/" TargetMode="External"/> There's something similar in 'ppt/diagrams/diagram1.xml' and 'ppt/diagrams/_rels/drawing1.xml.rels', but only the external relationship is recorded there. This originates from the following commit in 6.3, but it is an implementation error, as SmartArt export used to be more basic: https://git.libreoffice.org/core/commit/aafaf1f55fa413ad49d4556cf7c0a713dd206ae4 author Grzegorz Araminowicz <grzegorz.araminowicz@collabora.com> Wed Mar 13 10:49:30 2019 +0100 committer Miklos Vajna <vmiklos@collabora.com> Mon Apr 08 10:07:35 2019 +0200 "PPTX export: save SmartArt as diagram instead of group of shapes" A couple of other interesting commits: https://git.libreoffice.org/core/commit/dba1f992d0757b9c353dd41d55dd89ecafd70603 author Grzegorz Araminowicz <grzegorz.araminowicz@collabora.com> Fri Mar 08 12:45:24 2019 +0100 committer Miklos Vajna <vmiklos@collabora.com> Mon Mar 11 17:38:07 2019 +0100 "PPTX import: save SmartArt markup into InteropGrabBag" https://git.libreoffice.org/core/commit/58278ea997b92d02177b6641794f49a4c7005130 author Grzegorz Araminowicz <grzegorz.araminowicz@collabora.com> Fri Mar 15 23:50:13 2019 +0100 committer Miklos Vajna <vmiklos@collabora.com> Mon Mar 18 09:22:45 2019 +0100 "PPTX import: save also OOXDrawing in InteropGrabBag" Perhaps what could be done here is saving hyperlink relationships into the grab bags, and writing them back on export.