diff --git a/locales/cy/myrepresentations.json b/locales/cy/myrepresentations.json
index c776853d..e39e7422 100644
--- a/locales/cy/myrepresentations.json
+++ b/locales/cy/myrepresentations.json
@@ -35,6 +35,7 @@
     "fileupload-file-error-filesize-label": "yn rhy fawr. Llwythwch ffeil lai i fyny.",
     "fileupload-file-error-invalid-type-label": "mae ganddo fath annilys. Uwchlwythwch fath a ganiateir.",
     "fileupload-file-error-invalid-label": "yn annilys",
+    "fileupload-file-error-invalid-filename-label": "mae ganddo enw ffeil annilys",
     "capacity-para-one": "Mae'r ffurflen hon yn eich galluogi i gyflwyno sylwadau ar achos i Benderfyniadau Cynllunio ac Amgylchedd Cymru",
     "capacity-para-two": "Sylwch fod angen cyflwyno sylwadau gan bartïon â diddordeb o fewn yr amserlen. Mae hwn i'w weld ar y dudalen \"Crynodeb Achos\" flaenorol. Gall sylwadau a gyflwynir ar ôl y dyddiad hwn gael eu hystyried yn annilys.",
     "sips-capacity-para-one": "Mae'r ffurflen hon yn eich galluogi i gyflwyno ymateb i ymgynghoriad ar achos i Benderfyniadau Cynllunio ac Amgylchedd Cymru.",
diff --git a/locales/cy/newappeal.json b/locales/cy/newappeal.json
index 4ba06f38..b3e69546 100644
--- a/locales/cy/newappeal.json
+++ b/locales/cy/newappeal.json
@@ -86,6 +86,7 @@
     "new-appeal-fileupload-file-error-filesize-label": "yn rhy fawr. Llwythwch ffeil lai i fyny.",
     "new-appeal-fileupload-file-error-invalid-type-label": "mae ganddo fath annilys. Uwchlwythwch fath a ganiateir.",
     "new-appeal-fileupload-file-error-invalid-label": "yn annilys",
+    "new-appeal-fileupload-file-error-invalid-filename-label": "mae ganddo enw ffeil annilys",
     "s78-appeals-only-label": "Gallwch ddefnyddio'r porth hwn i gyflwyno apêl yn erbyn y canlynol yn unig:",
     "s78-appeals-only-bullet-one": "gwrthod caniatâd cynllunio",
     "s78-appeals-only-bullet-two": "methiant i benderfynu ar gais cynllunio o fewn 8 wythnos",
diff --git a/locales/en/myrepresentations.json b/locales/en/myrepresentations.json
index 8618b50f..2ede7c8f 100644
--- a/locales/en/myrepresentations.json
+++ b/locales/en/myrepresentations.json
@@ -35,6 +35,7 @@
     "fileupload-file-error-filesize-label": "is too large. Please upload a smaller file.",
     "fileupload-file-error-invalid-type-label": "has an invalid type. Please upload an allowed type.",
     "fileupload-file-error-invalid-label": "is invalid",
+    "fileupload-file-error-invalid-filename-label": "has invalid filename",
     "capacity-para-one": "This form enables you to submit representations on a case to Planning and Environment Decisions Wales.",
     "capacity-para-two": "Please note that representations from interested parties need to be made within the timetable. This can be found on the previous \"Case Summary\" page. Representations submitted after this date may be considered invalid.",
     "sips-capacity-para-one": "This form enables you to submit a consultation repsonse on a case to Planning and Environment Decisions Wales.",
diff --git a/locales/en/newappeal.json b/locales/en/newappeal.json
index 6414ee36..f6e31eeb 100644
--- a/locales/en/newappeal.json
+++ b/locales/en/newappeal.json
@@ -86,6 +86,7 @@
     "new-appeal-fileupload-file-error-filesize-label": "is too large. Please upload a smaller file.",
     "new-appeal-fileupload-file-error-invalid-type-label": "has an invalid type. Please upload an allowed type.",
     "new-appeal-fileupload-file-error-invalid-label": "is invalid",
+    "new-appeal-fileupload-file-error-invalid-filename-label": "has invalid filename",
     "s78-appeals-only-label": "You can only use this portal to submit an appeal against:",
     "s78-appeals-only-bullet-one": "a refusal of planning permission",
     "s78-appeals-only-bullet-two": "failure to determine a planning application within 8 weeks",